Structure of 2401-21-0
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CAS No. : | 2401-21-0 |
Formula : | C6H3Cl2I |
M.W : | 272.90 |
SMILES Code : | IC1=C(Cl)C(Cl)=CC=C1 |
MDL No. : | MFCD00001034 |
InChI Key : | VGJKBWPZBVBXGI-UHFFFAOYSA-N |
Pubchem ID : | 75459 |
GHS Pictogram: |
![]() |
Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 9 |
Num. arom. heavy atoms | 6 |
Fraction Csp3 | 0.0 |
Num. rotatable bonds | 0 |
Num. H-bond acceptors | 0.0 |
Num. H-bond donors | 0.0 |
Molar Refractivity | 49.18 |
TPSA ? Topological Polar Surface Area: Calculated from |
0.0 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
2.3 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
4.25 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
3.6 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
4.37 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
4.11 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
3.72 |
Log S (ESOL):? ESOL: Topological method implemented from |
-4.7 |
Solubility | 0.00541 mg/ml ; 0.0000198 mol/l |
Class? Solubility class: Log S scale |
Moderately soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.96 |
Solubility | 0.0298 mg/ml ; 0.000109 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-4.58 |
Solubility | 0.00719 mg/ml ; 0.0000264 mol/l |
Class? Solubility class: Log S scale |
Moderately soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
Low |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
Yes |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
Yes |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
Yes |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-4.95 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
1.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
2.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
2.21 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With copper(l) iodide; triethylamine;bis-triphenylphosphine-palladium(II) chloride; for 0.75h;Heating / reflux; | EXAMPLE 25A [(2,3-dichlorophenyl)ethynyl](trimethyl)silane <strong>[2401-21-0]1,2-Dichloro-3-iodobenzene</strong> (4.95 g, 18.1 mmol), trimethylsilylacetylene (2 g, 20 mmol), bis(triphenylphosphine)palladium(II)chloride (245 mg, 0.35 mmol), and copper(I)iodide (45 mg, 0.24 mmol) were combined in triethylamine (120 mL) and heated at reflux for 45 minutes. The mixture was allowed to cool to room temperature and was then partitioned between diethyl ether and saturated sodium chloride. The organic phase was dried with sodium sulfate, filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was taken directly on to the next step. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
39% | With sodium carbonate;tetrakis(triphenylphosphine) palladium(0); In ethanol; water; toluene; at 90℃; for 24h; | A solution of 2,3-dichloro-iodobenzene (6.00 G, 22. 0 mmol) in 60 mL toluene and 20 mL eth- anol was treated with 3-nitro-phenylboron. ic acid (4. 22 G, 25. 3 mmol) and NA2CO3 (2 N in H20, 30. 0 ML). Then mixture was purged with N2 for 5 min and Pd- (PPH3) (1. 02 G, 0. 879 mmol) was added. The mixture was heated to 90°C for 24 h and cooled to ambient temperature and concentrated in vacuo. The residual oil was partitioned with Et2O (80 M. L) and washed with dilute brine solution (3x50 mL), dried (Na2SO4), filtered, and concentrated under reduced pressure. The resulting white solid was recrystallized from hexane and to give the title compound (2.30 g, 39percent) as a fluffy white SOLID. 1H NMR (CDC13,400 MHz) 5 8.29 (m, 2H), 7.76 (m, 1H), 7.63 (t, J=7. 61 Hz, 1H), 7. 55 (m, 1H), 7. 31 (t, J=7.81 HZ, 1H), 7.26 (m, 1H.) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80.1% | With lithium chloride;trans-bis(triphenylphosphine)palladium dichloride; In toluene; at 20℃; for 96h;Heating / reflux; | Following the PROCEDURE OF (FUJITA et al. (1995) Tetrahedron Lett. 36 (29) : 5247-5250), A stirred solution of 4-TRIBUTYLSTANNANYL-PYRIDINE (5. 0 g, 13.6 mmol) in 60 mL of anhydrous toluene, lithium chloride (8.24 g, 194 mmol), 1, 2-dichloro-3- iodo-benzene (2.65 ML, 9.71 mmol) was made. The mixture was then degassed several times by bubbling nitrogen through the solution via syringe and then trans-dichlorobis (triphenylphosphine) palladium (II) was added. The mixture was heated under nitrogen atmosphere at reflux for 96 hours. The reaction mixture was then allowed to cool to ambient tempera- ture and partitioned between toluene and brine. The organic layer was separated and saturated KF was added and the mixture was stirred for 24 h. The organic layer was filtered, and condensed in vacuo to provide Example 1A (1.76 g, 80. 1percent) as a white solid NMR (CDC13, 400 MHz) 5 8.7 (dd, J=1.56, 4.69 Hz, 2H), 7. 53 (dd, J=1. 56,7. 81 Hz, 1H),'7. 34 (s, J=1.56, 4.29 Hz, 2H), 7.29 (t, J=8 Hz, 1H), 7.21 (s, J=1. 56,7. 42 Hz, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
19% | With N-Methyldicyclohexylamine; tetrabutyl-ammonium chloride;palladium diacetate; In N,N-dimethyl acetamide; at 100℃; for 16h; | Example 93 (S)-2-({1-[(E)-3-(2, 3-DICHLORO-PHENYL)-BUT-2-ENOYL]- PIPERIDINE-4-CARBONYL}-AMINO)-PROPIONIC acid Example 93A (E)-3- (2, 3-Dichloro-phenyl) -but-2-enoic acid ethyl ester A stirred solution of 2,3-dichloroiodoben- zene (3.00 g, 11.0 mmol) in dimethyl acetamide (10 ML) was heated to 100°C for 16 h with tetrabutyl- ammonium chloride (2.78 g, 10.0 mmol), palladium acetate (90 mg, 0.40 mmol), dicyclohexyl methylamine (2.93, 15.0 mmol), and ethyl crotonate (1.41 g, 10.0 mmol) under N2 [procedure taken from Buchwald (1995) Chem. Eur. J 5: 3107-3112]. The reaction was diluted with methylene chloride (30 mL), and washed with 1N aqueous HC1 (3X20 mL) and water (3X20 mL). The organic phase was dried (NA2SO4), filtered, and concentrated to obtain an orange oil. The crude product was purified on a Biotage Flash 40 chroma- tography system eluting with the following gradient: 3percent methyl tert-butyl ether in petroleum ether (1 L) then 5percent methyl tert-butyl ether in petroleum ether (500 mL). Example 93A (500 mg, 19percent) was obtained as a white powder. 1H NMR (CDC13, 400 MHz) 5 7.42 (dd, J=8.20, 1.56 Hz, 1H), 7.19 (m, 1H), 7.08 (dd, J=7.81, 1.56 Hz, 1H), 5.81 (m, 1H), 4.22 (q, J=7.16 Hz, 2H), 2.47 (d, J=1.56 Hz, 3H), 1.32 (t, J=7.22 Hz, 3H). Based ON 1H NMR analysis, Example 93A had the"E"olefin geometry (see, Dyker (1999) Helv. Chim. Acta 82 : 588-596, for NMR data of an analogous o-bromo analogue). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With magnesium; In water; cadmium(II) chloride; benzene; | Method A Grignard reagent was prepared in conventional manner as follows: The dichloroiodobenzene was added to magnesium over 1-2 hours and the resulting solution was refluxed for about 4 hours. As all the Mg had not dissolved the Grignard was allowed to stir at room temperature overnight. The flask was then cooled in ice and the dry cadmium chloride added portionwise over 10 minutes. When all the cadmium chloride had been added the reaction mixture was allowed to warm to room temperature and was then heated under reflux for 45 minutes. The ether was evaporated off and the residue washed twice with dry benzene which, in was turn, also evaporated off. The residue was then taken and treated with ethyl oxalyl chloride in 20 mls dry benzene. This was added slowly from a dropping funnel with stirring. The reaction was very vigorous. When addition was complete and spontaneous reflux had subsided the reaction mixture was refluxed for a further hour. The reaction mixture was then cooled in an ice bath. Ice/water was carefully added. Sufficient 20percent H2 SO4 was then added to give two clear phases. The aqueous phase was separated and extracted twice with benzene. The benzene layers were combined and extracted 1*water, 1*Na2 CO3 solution, 1*water and 1*NaCl solution. The benzene solution was then dried over MgSO4, filtered and evaporated down. 17.5 g crude material was obtained. NMR and TLC analyses were performed. TLC in Si/CHCl3 gave two spots, one corresponding to the title compound (product) and one to the dichloroiodobenzene (starting material). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With magnesium; In diethyl ether; | Method C 2,3-Dichloroiodobenzene (350 g, 1.282 mol) dissolved in dry ether (1250 ml) was added slowly, with stirring, to magnesium turnings (30.77 g, 1.282 mol) in dry diethyl ether (300 ml), in order to form 2,3-dichlorophenylmagnesium iodide under nitrogen. | |
With magnesium; In diethyl ether; | Method C 2,3-Dichloroiodobenzene (350 g, 1.282 mol) dissolved in dry ether (1250 ml) was added slowly, with stirring, to magnesium turnings (30.77 g, 1.282 mol) in dry diethyl ether (300 ml), in order to form 2,3-dichlorophenylmagnesium iodide under nitrogen. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; triethylamine; In dichloromethane; water; ethyl acetate; | (f) Synthesis of p-Nitrobenzyl (5R,6S)-6-[(R)-1-Hydroxyethyl]-2-Chloro-2-Ethanesulfinyl-1-Carbapenam-3-Carboxylate (Compound S15) STR39 Under a dry atmosphere, to a dichloromethane (4 ml) solution of Compound S14 (59 mg, 0.15 mmol) were added water (0.014 ml, 0.78 mmol) and pyridine (0.036 ml, 0.45 mmol), and further added dropwise a dichloromethane (2 ml) solution of iodobenzene dichloride (103 mg, 0.37 mmol) under ice-cooling, and the mixture was stirred at the same temperature for 30 minutes. Subsequently, triethylamine (0.042 ml, 0.30 mmol) was added and the mixture was stirred for 10 minutes. The reaction mixture was diluted with ethyl acetate, washed with an aqueous 5percent citric acid solution and water. The aqueous layer was reverse-extracted with ethyl acetate. The ethyl acetate solutions were combined, washed with an aqueous NaCl-saturated solution and dried. The solvent was removed by distillation under reduced pressure. The residue was purified by a medium pressure silica gel column chromatography (Lobar size A, ethyl acetate-hexane 3:2-->1:0) to obtain a mixture (pale yellowish viscous material, 51 mg, 77percent) of some isomers of Compound S15. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In dichloromethane; | EXAMPLE 4 200 mg of 3-alpha-cholestanyl nicotinate (0.4 mmoles) and 130 mg of iodobenzenedichloride were dissolved in 19 ml of dichloromethane. 200 ml of epoxybutane (2.3 mmoles) was added as a hydrogen chloride scavenger and the solution was irradiated with a sunlamp for 10 minutes. 9-chloro-3-alpha cholestanyl nicotinate was isolated by evaporating the solvent and was purified on a silica column. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In tetrahydrofuran; diethyl ether; water; ethyl acetate; | EXAMPLE 48 5-Chloro-4-methoxy-2,2-dimethyl-2,3-dihydro-7-benzofurancarboxylic acid A mixture of methyl 4-methoxy-2,2-dimethyl-2,3-dihydro-7-benzofurancarboxylate, 7.1 g of pyridine, and 400 ml of tetrahydrofuran was cooled to -30° C. by means of an external dry ice/acetone bath. A solution of 27.5 g of iodobenzene dichloride in 100 ml of dry tetrahydrofuran was added dropwise to the mixture. After addition was complete, the reaction was stirred at room temperature overnight. The reaction mixture was concentrated in vacuo, water was added, and the mixture was steam distilled. To the residue were added ethyl acetate and diethyl ether. The organic mixture was washed with water, dried over sodium sulfate, and concentrated in vacuo. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In chloroform; | 1.68 g of 17-(m-iodobenzoyloxy)-3-oxo-androst-4-ene-17beta-carboxylic acid and 825 mg of iodobenzene dichloride were gasified with argon in 340 ml of chloroform and exposed for 20 minutes with a mercury high-pressure lamp. The solution was washed with dilute sodium bisulphite solution and water, dried and evaporated in vacuo. Chromatography on silica gel gave 9alpha-chloro-17-(m-iodobenzoyloxy)-3-oxo-androst-4-ene-17beta-carboxylic acid of melting point 236°-237° C.; [alpha]D =-40° (dioxan, c=0.1percent); epsilon220 =34,900. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
25.9 g (94.2%) | With chlorine; In chloroform; | EXAMPLE 6 Preparation of iodobenzene dichloride. Chlorine gas is bubbled through a solution of iodobenzene (20.4 g; 0.1 mole) in chloroform (100 ml) while the temperature of the reaction mixture is maintained at -5° C. In about 10 minutes a yellow solid precipitates and is removed by filtration. The filtrate is then further treated with chlorine gas until the formation of yellow solid ceases. The solid fractions are combined and air dried to afford 25.9 g (94.2percent) of title product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In tetrahydrofuran; | EXAMPLE 45 A solution of 5-aminospiro[benzo[b]furan-2(3H),1'-cyclopropane]-3-one (0.181 g.) and pyridine (0.083 mg.) in tetrahydrofuran (5 ml.) was cooled to -17° C. To the solution was added dropwise iodobenzenedichloride (0.282 g.), which had been prepared by conventional method, dissolved in tetrahydrofuran (1.5 ml.) over 50 minutes, followed by stirring for 1 hour. The reaction mixture was poured into ice-water and extracted with ethyl acetate. The extract was washed with water, dried and the solvent was evaporated off. The residue was subjected to column-chromatography, using chloroform as the eluent. The first fraction was concentrated under reduced pressure to remove the solvent. By the above procedure, there was obtained 5-amino-4-chlorospiro[benzo[b]furan-2(3H),1'-cyclopropane]-3-one as yellow crystals. Yield 0.038 g. Mass spectrum: C12 H12 O2 NCl, molecular ion peak (209). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; sodium hydrogensulfite; In tetrahydrofuran; water; ethyl acetate; | PREPARATION 73 A mixture of 4'-amino-3'-(2,4-difluorophenoxy)acetophenone (1.7 g), pyridine (0.52 g), and iodobenzene dichloride (1.8 g) in tetrahydrofuran (20 ml) was stirred overnight at 5° C. The mixture was concentrated. The residue was dissolved in ethyl acetate and washed with water, an aqueous solution of sodium bisulfite, and water. The organic layer was evaporated to give a powder of 4'-amino-3'-chloro-5'-(2,4-difluorophenoxy)acetophenone (1.5 g). mp: 142° to 144° C. IR (Nujol): 3500, 3400, 1670, 1610, 1565, 1505 cm-1. NMR (CDCl3, delta): 2.43 (3H, s), 4.85 (2H, broad s), 6.7-7.3 (4H, m), 7.65 (1H, d, J=2 Hz). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In tetrahydrofuran; | PREPARATION 1 A mixture of p-aminoacetophenone (20 g), pyridine (11.7 g), and iodobenzene dichloride (40 g) in tetrahydrofuran (300 ml) was stirred for 5 hours at 0° C. The insoluble materials were filtered, and the filtrate was concentrated under reduced pressure. The residue obtained was crystallized from ethanol to give colorless crystals of 4'-amino-3'-chloroacetophenone (20.1 g). IR (Nujol): 3420, 3340, 3230, 1665, 1635, 1590 cm-1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; sodium hydrogen sulphite; In tetrahydrofuran; hexane; chloroform; ethyl acetate; | PREPARATION 5 A mixture of p-aminopropiophenone (5 g), pyridine (2.7 g), and iodobenzene dichloride (7.5 g) in tetrahydrofuran (150 ml) was stirred for 3 hours at 0° to 5° C. The insoluble materials were filtered, and the filtrate was concentrated under reduced pressure. The residue was dissolved in chloroform, washed with an aqueous solution of sodium hydrogen sulfite, dried over magnesium sulfate, and concentrated to give an oil (8.8 g). The oil was subjected to column chromatography on silica gel eluding with chloroform. The fractions containing the desired compound were combined and concentrated under reduced pressure. The residual oil was triturated with a mixture of hexane and ethyl acetate to give pale yellow crystals of 4'-amino-3'-chloropropiophenone (1.1 g). mp: 79° to 80° C. IR (Nujol): 3500, 3380, 1670, 1620, 1595 cm-1. NMR (CDCl3, delta): 1.20 (3H, t, J=7 Hz), 2.88 (2H, q, J=7 Hz), 4.50 (2H, broad s), 6.72 (1H, d, J=8 Hz), 7.68 (1H, dd, J=8 Hz, 2 Hz), 7.88 (1H, d, J=2 Hz). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine;pyrographite; In tetrahydrofuran; ethanol; ethyl acetate; | EXAMPLE 12 2-Amino-5-chloro-N-cyclohexyl-N-methyl-3-trifluoromethylbenzylamine and its hydrochloride by method B A solution of 9.5 gm of 2-amino-N-cyclohexyl-N-methyl-3-trifluoromethyl-benzylamine and 3 ml of pyridine in 40 ml of tetrahydrofuran was cooled to -10°C, and while stirring at this temperature it was admixed in the course of 20 minutes with a solution of 9.1 gm of iodobenzene dichloride in 80 ml of tetrahydrofuran. After stirring it for 4.5 hours at 0° to -10°C, the mixture was allowed to stand for 18 hours at 20°C. Thereafter, the reaction mixture was diluted with water and extracted with chloroform. The organic phase was washed with aqueous potassium carbonate and water, and after drying it over magnesium sulfate, the solution was evaporated in vacuo, and the oily residue, the free base 2-amino-5-chloro-N-cyclohexyl-N-methyl-3-trifluoromethyl-benzylamine, was taken up in ethyl acetate. The hydrochloride of the base was precipitated from this solution with isopropanolic hydrochloric acid. After recrystallizing the salt three times from ethanol in the presence of charcoal, colorless crystals were obtained which had a melting point of 260°-262°C. | |
With pyridine;pyrographite; In tetrahydrofuran; ethanol; ethyl acetate; | EXAMPLE 12 2-Amino-5-chloro-N-cyclohexyl-N-methyl-3-trifluoromethyl-benzylamine and its hydrochloride by method B A solution of 9.5 gm of 2-amino-N-cyclohexyl-N-methyl-3-trifluoromethyl-benzylamine and 3 ml of pyridine in 40 ml of tetrahydrofuran was cooled to -10° C, and while stirring at this temperature it was admixed in the course of 20 minutes with a solution of 9.1 gm of iodobenzene dichloride in 80 ml of tetrahydrofuran. After stirring it for 4.5 hours at 0° to -10° C, the mixture was allowed to stand for 18 hours at 20° C. Thereafter, the reaction mixture was diluted with water and extracted with chloroform. The organic phase was washed with aqueous potassium carbonate and water, and after drying it over magnesium sulfate, the solution was evaporated in vacuo, and the oily residue, the free base 2-amino-5-chloro-N-cyclohexyl-N-methyl-3-trifluoromethyl-benzylamine, was taken up in ethyl acetate. The hydrochloride of the base was precipitated from this solution with isopropanolic hydrochloric acid. After recrystallizing the salt three times from ethanol in the presence of charcoal, colorless crystals were obtained which had a melting point of 260°-262° C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; hydrogenchloride; ammonia; In tetrahydrofuran; | EXAMPLE 3 1-(4'-Amino-3'-chloro-5'-trifluoromethyl-phenyl)-2-tert.pentylamino-ethanol hydrochloride by method B 0.37 gm of 1-(4'-amino-3'-trifluoromethyl-phenyl)-2-tert.pentylamino-ethanol hydrobromide and 0.2 ml of pyridine were dissolved in 30 ml of tetrahydrofuran, and the solution was cooled to 0° C. 0.3 gm of iodobenzene dichloride was added, the mixture was held for 2 hours at 0° C., and 0.1 gm of iodobenzene dichloride was again added. After standing for 20 hours at about 4° C., the solution was evaporated, distributed between ethyl acetate and water, the aqueous phase was made alkaline with 2N ammonia, and the solution was again extracted with ethyl acetate. The organic phase was washed with water, dried and a few drops of isopropanolic 4N hydrochloric acid were added. The precipitated hydrochloride of the above-mentioned compound was suction-filtered off and washed with ether. M.p. 176°-178° C. (decomp.). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In tetrahydrofuran; ethanol; | EXAMPLE 97 d-1-(4'-Amino-3'-chloro-5'-fluoro-phenyl)-2-tert.butylamino-ethanol 0.26 gm of d-1-(4'-amino-3'-fluoro-phenyl)-2-tert.butylamino-ethanol hydrochloride and 0.2 ml of pyridine were dissolved in 30 ml of tetrahydrofuran, and the solution was cooled to 0° C. 0.3 gm of iodobenzene dichloride were added, the mixture was held at 0° C. for 2 hours, and then 0.1 gm of iodobenzene dichloride was added again. After standing for 20 hours at about 4° C. the solution was evaporated, and the residue was distributed between ethyl acetate and water. The aqueous phase was made alkaline with 2N ammonia and was then extracted again with ethyl acetate. The organic phase was washed with water, dried and evaporated to dryness in vacuo. The residue was dissolved in absolute ethanol, the solution was neutralized with ethanolic hydrochloric acid, and the hydrochloride of the above-named compound was caused to crystallize by addition of ether. M.p. 210°-211° C. (decomp.). [alpha]36420 = +139.6° (c = 2.0; methanol). |