* 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.
Reference：
[1] Journal of the Chemical Society, Chemical Communications, 1988, # 5, p. 382 - 384
[2] Journal of Medicinal Chemistry, 2013, vol. 56, # 7, p. 2841 - 2849
2
[ 35661-40-6 ]
[ 129397-83-7 ]
Yield
Reaction Conditions
Operation in experiment
96%
Stage #1: With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine In ethyl acetate at 0℃; for 0.166667 h; Stage #2: With sodium tetrahydroborate In water; ethyl acetate at 0℃; for 0.416667 h;
General procedure: To a solution of carboxylic acid (10 mmol) in THF (10 mL), DIPEA (11 mmol, 1.42 mL) and 50percent T3P in EtOAc (20 mmol, 6.36 mL) were added at 0 °C and the solution was stirred for about 10 min. Then aqueous solution of NaBH4 (10 mmol, 388 mg in 0.3 mL of H2O) was added to the reaction mixture at the same temperature and the reaction was allowed to stir till the completion of the reaction as indicated by TLC. After the completion of the reaction, the solvent was evaporated and the crude alcohol was extracted into EtOAc and the organic phase was washed with 5percent citric acid (10 mL .x. 2), 5percent Na2CO3 (10 mL .x. 2), water, and brine solution. The product was isolated after the evaporation of solvent under reduced pressure and dried over anhydrous Na2SO4.
Reference：
[1] Tetrahedron Letters, 2012, vol. 53, # 38, p. 5059 - 5063
[2] Journal of Organic Chemistry, 2001, vol. 66, # 25, p. 8454 - 8462
[3] Tetrahedron Letters, 2000, vol. 41, # 32, p. 6131 - 6135
[4] Organic Letters, 2008, vol. 10, # 10, p. 1881 - 1884
[5] Tetrahedron Letters, 1999, vol. 40, # 23, p. 4395 - 4396
[6] Tetrahedron Asymmetry, 1998, vol. 9, # 11, p. 1855 - 1858
[7] Journal of Organic Chemistry, 1993, vol. 58, # 8, p. 2313 - 2316
[8] Journal of Organic Chemistry, 2009, vol. 74, # 15, p. 5260 - 5266
[9] Synthetic Communications, 2009, vol. 39, # 19, p. 3555 - 3566
[10] Journal of Organic Chemistry, 2014, vol. 79, # 17, p. 8422 - 8427
[11] ACS Combinatorial Science, 2017, vol. 19, # 3, p. 131 - 136
[12] Organic and Biomolecular Chemistry, 2018, vol. 16, # 26, p. 4874 - 4880
Reference：
[1] Angewandte Chemie - International Edition, 2015, vol. 54, # 38, p. 11214 - 11218[2] Angew. Chem., 2016, vol. 127, # 38, p. 11366 - 11370,5
[3] Chirality, 2018, vol. 30, # 9, p. 1067 - 1078
9
[ 50-00-0 ]
[ 35661-40-6 ]
[ 77128-73-5 ]
Reference：
[1] Journal of Medicinal Chemistry, 2007, vol. 50, # 24, p. 5878 - 5881
10
[ 35661-40-6 ]
[ 77128-73-5 ]
Reference：
[1] Tetrahedron, 2012, vol. 68, # 31, p. 6186 - 6192
[2] European Journal of Organic Chemistry, 2013, # 21, p. 4509 - 4513
[3] Tetrahedron, 2014, vol. 70, # 14, p. 2351 - 2358
[4] Bioorganic and Medicinal Chemistry, 2016, vol. 24, # 6, p. 1163 - 1170
11
[ 35661-40-6 ]
[ 169624-67-3 ]
Yield
Reaction Conditions
Operation in experiment
16.2 mg
Stage #1: With piperidine In N,N-dimethyl-formamide at 20℃; for 0.833333 h; Stage #2: With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In dichloromethane; N,N-dimethyl-formamide at 20℃; for 16 h; Stage #3: With trifluoroacetic acid In dichloromethane; N,N-dimethyl-formamide for 1 h;
General procedure: The Fmoc-amino acid-Wang resin (300 mg) was suspended in a 30percent piperidine solution in DMF and stirred 50 min at r.t (room temperature).The resin was washed with CH2Cl2 (3×2 mL), EtOAc(3×2 mL), MeOH (3×2 mL) and CH2Cl2 (2 mL), and finally dried in vacuum. The resin was suspended in 5 mL of a DMF:DCM (2:1) mixture and Fmoc-amino acid (3 equiv.), 1-hydroxybenzotriazole (3 equiv.), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (3 equiv.) and diisopropylethylamine(3 equiv.) were successively added. The solution was stirred at r.t. for 16 h. After this, the resin was washed with DMF(3×2 mL), CH2Cl2 (3×2 mL), MeOH (3×2 mL) and CH2Cl2 (2 mL), and finally dried in vacuum. Resin was treated with 5 mL of 10percent TFA in CH2Cl2 for 1 h. The mixture was filtered and the filtrate was evaporated under reduced pressure to give the crude product.
[(R)-1-[(R)-1-{(R)-2-Benzyloxy-1-[(R)-1-((S)-1-carbamoyl-ethylcarbamoyl)-2-phenyl-ethylcarbamoyl]-ethylcarbamoyl}-2-(4-benzyloxy-phenyl)-ethylcarbamoyl]-2-(1H-imidazol-4-yl)-ethyl]-carbamic acid benzyl ester[ No CAS ]
[(R)-1-((R)-1-{(R)-2-Benzyloxy-1-[(R)-1-((S)-1-carbamoyl-ethylcarbamoyl)-2-(1H-indol-3-yl)-ethylcarbamoyl]-ethylcarbamoyl}-2-phenyl-ethylcarbamoyl)-2-(1H-imidazol-4-yl)-ethyl]-carbamic acid benzyl ester[ No CAS ]
N-α-(9-fluorenylmethyloxycarbonyl)-N-γ-tert-butyloxycarbonyl-D-2,4-diaminobutyric acid[ No CAS ]
Nα-(9-fluorenylmethyloxycarbonyl)-Nγ-2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl-L-arginine[ No CAS ]
C75H115N23O18S2[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
1. Peptide synthesis 1.1 General synthetic procedures A general method for the synthesis of the peptidomimetics of the present invention is exemplified in the following. This is to demonstrate the principal concept and does not limit or restrict the present invention in any way. A person skilled in the art is easily able to modify these procedures, especially, but not limited to, choosing a different starting position within the ring system, to still achieve the preparation of the claimed cyclic peptidomimetic compounds of the present invention. Coupling of the first protected amino acid residue to the resin . In a dried flask, 2-chlorotritylchloride resin (polystyrene, 1percent crosslinked; loading: 1.4 mMol/g) was swollen in dry CH2CI2 for 30 min (7 mL CH2CI2 per g resin). A solution of 0.8 eq of the Fmoc-protected amino acid and 6 eq of DIPEA in dry CH2CI2/DMF (4/1) (10 mL per g resin) was added. After shaking for 2-4 h at rt the resin was filtered off and washed successively with CH2CI2, DMF, CH2CI2, DMF and CH2CI2. Then a solution of dry CH2CI2/MeOH/DIPEA (17:2:1) was added (10 mL per g resin). After shaking for 3 x 30 min the resin was filtered off in a pre-weighed sinter funnel and washed successively with CH2CI2, DMF, CH2CI2, MeOH, CH2CI2, MeOH, CH2CI2 (2x) and Et20 (2x). The resin was dried under high vacuum overnight. The final mass of resin was calculated before the qualitative control. Loading was typically 0.6 - 0.7 mMol/g. The following preloaded resins were prepared: Fmoc-Dab(Boc)-2-chlorotrityl resin, Fmoc-DDab(Boc)-2-chlorotrityl resin, Fmoc-Lys(Boc)-2-chlorotrityl resin, Fmoc- Trp(Boc)-2-chlortrityl resin, Fmoc-Phe-2-chlortrityl resin; Fmoc-Val-2-chlorotrityl resin, Fmoc-Pro-2-chlorotrityl resin, Fmoc-Arg(Pbf)-2-chlorotrityl resin and Fmoc-Glu(iBu)-2- chlorotrityl resin. Synthesis of the fully protected peptide fragment The synthesis was carried out on a Syro-peptide synthesizer (MultiSynTech GmbH) using 24 to 96 reaction vessels. In each vessel 0.04 mMol of the above resin were placed and the resin was swelled in CH2CI2 and DMF for 15 min, respectively. The following reaction cycles were programmed and carried out: Step Reagent Time 1 CH2CI2, wash and swell (manual) 1 x 3 min 2 DMF, wash and swell 2 x 30 min 3 20percent piperidine/DMF 1 x 5 min and 1 x 15 min 4 DMF, wash 5 x 1 min 5 3.5 eq Fmoc amino acid/3.5 eq HOAt in DMF + 3.5 eq PyBOP/7 eq DIPEA or 3.5 eq DIC 1 x 40 min 6 3.5 eq Fmoc amino acid/DMF + 3.5 eq HATU or PyBOP or HCTU + 7 eq DIPEA 1 x 40 min 7 DMF, wash 5 x 1 min 8 20percent piperidine/DMF 1 x 5 min and 1 x 15 min 9 DMF, wash 5 x 1 min 10 CH2CI2, wash (at the end of the synthesis) 3 x 1 min Steps 5 to 9 are repeated to add each amino-acid residue. After the termination of the synthesis of the fully protected peptide fragment, one of the procedures A - E, as described herein below, was adopted subsequently, depending on which kind of interstrand linkages, as described herein below, were to be formed. Finally, the peptides were purified by preparative reverse phase LC-MS, as described herein below. Procedure A: Cyclization and work up of a backbone cyclized peptide having no interstrand linkage Cleavage, backbone cyclization and deprotection After assembly of the linear peptide, the resin was suspended in 1 mL of 1percent TFA in CH2CI2 (v/v; 0.14 mMol) for 3 minutes. After filtration the filtrate was neutralized with 1 mL of 20percent DI PEA in CH2CI2 (v/v; 1.15 mMol). This procedure was repeated four times to ensure completion of the cleavage. An alternative cleavage method comprises suspension of the resin in lmL of 20percent HFIP in CH2CI2 (v/v; 1.9 mMol) for 30 minutes, filtration and repetition of the procedure. The resin was washed three times with 1 mL of CH2CI2. The CH2CI2 layers containing product were evaporated to dryness. The fully protected linear peptide was solubilised in 8 mL of dry DM F. Then 2 eq of HATU and 2 eq of HOAt in dry DM F (1-2 mL) and 4 eq of DIPEA in dry DM F (1-2 mL) were added to the peptide, followed by stirring for ca. 16 h. The volatiles were removed by evaporation. The crude cyclic peptide was dissolved in 7 mL of CH2CI2 and washed three times with 4.5 mL 10percent acetonitrile in water (v/v). The CH2CI2 layer was then evaporated to dryness. To fully deprotect the peptide, 7 mL of cleavage cocktail TFA/DODT/thioanisol/H20 (87.5 :2.5:5:5) or TFA/TIS/H20 (95:2.5 :2.5) were added, and the mixture was kept for 2.5-4 h at room temperature until the reaction was completed. The reaction mixture was evaporated close to dryness, the peptide precipitated with 7 mL of cold Et20/pentane and finally washed 3 times with 4 mL of cold Et20/pentane. Procedures Bl and B2: Cyclization and work up of a backbone cyclized peptide having a disulfide interstrand linkage Bl: Formation of a disulfide interstrand linkage using DMSO After cleavage, backbone cyclization and deprotection of the linear peptide, as described in the corresponding section of procedure A, th...
N-α-(9-fluorenylmethyloxycarbonyl)-N-γ-tert-butyloxycarbonyl-D-2,4-diaminobutyric acid[ No CAS ]
C73H113N21O17S2[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
1. Peptide synthesis 1.1 General synthetic procedures A general method for the synthesis of the peptidomimetics of the present invention is exemplified in the following. This is to demonstrate the principal concept and does not limit or restrict the present invention in any way. A person skilled in the art is easily able to modify these procedures, especially, but not limited to, choosing a different starting position within the ring system, to still achieve the preparation of the claimed cyclic peptidomimetic compounds of the present invention. Coupling of the first protected amino acid residue to the resin . In a dried flask, 2-chlorotritylchloride resin (polystyrene, 1percent crosslinked; loading: 1.4 mMol/g) was swollen in dry CH2CI2 for 30 min (7 mL CH2CI2 per g resin). A solution of 0.8 eq of the Fmoc-protected amino acid and 6 eq of DIPEA in dry CH2CI2/DMF (4/1) (10 mL per g resin) was added. After shaking for 2-4 h at rt the resin was filtered off and washed successively with CH2CI2, DMF, CH2CI2, DMF and CH2CI2. Then a solution of dry CH2CI2/MeOH/DIPEA (17:2:1) was added (10 mL per g resin). After shaking for 3 x 30 min the resin was filtered off in a pre-weighed sinter funnel and washed successively with CH2CI2, DMF, CH2CI2, MeOH, CH2CI2, MeOH, CH2CI2 (2x) and Et20 (2x). The resin was dried under high vacuum overnight. The final mass of resin was calculated before the qualitative control. Loading was typically 0.6 - 0.7 mMol/g. The following preloaded resins were prepared: Fmoc-Dab(Boc)-2-chlorotrityl resin, Fmoc-DDab(Boc)-2-chlorotrityl resin, Fmoc-Lys(Boc)-2-chlorotrityl resin, Fmoc- Trp(Boc)-2-chlortrityl resin, Fmoc-Phe-2-chlortrityl resin; Fmoc-Val-2-chlorotrityl resin, Fmoc-Pro-2-chlorotrityl resin, Fmoc-Arg(Pbf)-2-chlorotrityl resin and Fmoc-Glu(iBu)-2- chlorotrityl resin. Synthesis of the fully protected peptide fragment The synthesis was carried out on a Syro-peptide synthesizer (MultiSynTech GmbH) using 24 to 96 reaction vessels. In each vessel 0.04 mMol of the above resin were placed and the resin was swelled in CH2CI2 and DMF for 15 min, respectively. The following reaction cycles were programmed and carried out: Step Reagent Time 1 CH2CI2, wash and swell (manual) 1 x 3 min 2 DMF, wash and swell 2 x 30 min 3 20percent piperidine/DMF 1 x 5 min and 1 x 15 min 4 DMF, wash 5 x 1 min 5 3.5 eq Fmoc amino acid/3.5 eq HOAt in DMF + 3.5 eq PyBOP/7 eq DIPEA or 3.5 eq DIC 1 x 40 min 6 3.5 eq Fmoc amino acid/DMF + 3.5 eq HATU or PyBOP or HCTU + 7 eq DIPEA 1 x 40 min 7 DMF, wash 5 x 1 min 8 20percent piperidine/DMF 1 x 5 min and 1 x 15 min 9 DMF, wash 5 x 1 min 10 CH2CI2, wash (at the end of the synthesis) 3 x 1 min Steps 5 to 9 are repeated to add each amino-acid residue. After the termination of the synthesis of the fully protected peptide fragment, one of the procedures A - E, as described herein below, was adopted subsequently, depending on which kind of interstrand linkages, as described herein below, were to be formed. Finally, the peptides were purified by preparative reverse phase LC-MS, as described herein below. Procedure A: Cyclization and work up of a backbone cyclized peptide having no interstrand linkage Cleavage, backbone cyclization and deprotection After assembly of the linear peptide, the resin was suspended in 1 mL of 1percent TFA in CH2CI2 (v/v; 0.14 mMol) for 3 minutes. After filtration the filtrate was neutralized with 1 mL of 20percent DI PEA in CH2CI2 (v/v; 1.15 mMol). This procedure was repeated four times to ensure completion of the cleavage. An alternative cleavage method comprises suspension of the resin in lmL of 20percent HFIP in CH2CI2 (v/v; 1.9 mMol) for 30 minutes, filtration and repetition of the procedure. The resin was washed three times with 1 mL of CH2CI2. The CH2CI2 layers containing product were evaporated to dryness. The fully protected linear peptide was solubilised in 8 mL of dry DM F. Then 2 eq of HATU and 2 eq of HOAt in dry DM F (1-2 mL) and 4 eq of DIPEA in dry DM F (1-2 mL) were added to the peptide, followed by stirring for ca. 16 h. The volatiles were removed by evaporation. The crude cyclic peptide was dissolved in 7 mL of CH2CI2 and washed three times with 4.5 mL 10percent acetonitrile in water (v/v). The CH2CI2 layer was then evaporated to dryness. To fully deprotect the peptide, 7 mL of cleavage cocktail TFA/DODT/thioanisol/H20 (87.5 :2.5:5:5) or TFA/TIS/H20 (95:2.5 :2.5) were added, and the mixture was kept for 2.5-4 h at room temperature until the reaction was completed. The reaction mixture was evaporated close to dryness, the peptide precipitated with 7 mL of cold Et20/pentane and finally washed 3 times with 4 mL of cold Et20/pentane. Procedures Bl and B2: Cyclization and work up of a backbone cyclized peptide having a disulfide interstrand linkage Bl: Formation of a disulfide interstrand linkage using DMSO After cleavage, backbone cyclization and deprotection of the linear peptide, as described in the corresponding section of procedure A, th...
Coupling reactions and removal of Fmoc protection were conducted under microwave irradiation at 50 oC. Fmoc-TentaGel Sieber Amide resin (120 mg, 24 mmol) was swollen in DCM (2 mL) for 30 min, then the resin was rinsed with DCM (3 x 2 mL), DMF (3 x 2 mL), DCM (3 x 2 mL), and DMF (3 x 2 mL). For the removal of Fmoc protection, the resin was stirred with 20percent piperidine/DMF (2 mL) for 3 min. The unreacted amino groups were capped by acetylation with Ac2O/DIEA/DMF solution (10:5:85, v/v/v, 2 mL) for 30 sec. The appropriate Fmoc-amino acids (5.0 equiv.) were incorporated to the resin with HBTU (5.0 equiv.), HOBt (5.0 equiv.), DIEA (10 equiv.) in DMF (0.6 mL) for 9 min under microwave irradiation. The coupling reaction with 1 (1.2 equiv.) were carried out with PyBOP (1.2 equiv.), HOAt (1.2 equiv.), DIEA (3.0 equiv.) in DMF (0.12 mL) for 10 min under microwave irradiation, then PyBOP (1.2 equiv.) and HOAt (1.2 equiv.) was added to the reaction mixture and stirred for another 10 min under microwave irradiation.
General procedure: 100mg 2-chlorotrityl resin (0.5mmol/g) was swollen in dry DCM for 30min and treated with the first building block (2.0equiv) and DIEA (4.0equiv) in dry DCM. After it was shook for 1h, 80muL MeOH was added to cap the unreacted resin for another 20min. The loaded resin was washed by DCM (3×2mL) and DMF (3×2mL). Fmoc deprotection was achieved by shaken with 2mL 20percent solution of piperidine in DMF for 20min. The following Fmoc- or Boc-amino acids (4.0equiv) was coupled using 32 HATU (4.0equiv) as coupling reagent and DIEA (8.0 equiv) as base. The mixture was shaken in DMF for 1h. After each Fmoc deprotection and coupling reaction, the resin was washed by DMF (3×2mL), DCM (3×2mL) and DMF (3×2mL). The loaded resin was washed by DCM (3×2mL) and then a solution of Pd(PPh3)4 (1.0equiv) and phenylsilane (25equiv) in 2mL anhydrous DCM was added. The mixture was shaken for 1h under the protection of dry argon. After Alloc deprotection was completed, the resin was washed by DMF (3×2mL), DCM (3×2mL) and DMF (3×2mL). After coupling of the last building block, the resin was washed by DCM (3 2 mL), DMF (3 2 mL) and DCM (5 2 mL). Then a cocktail of DCM/AcOH/TFE (v/v/v = 8:1:1) was added to the resinand shaken for 1.5 h. Then the resin was filtrated off and rinsedwith DCM (5 2 mL). The combined filtrates were concentrated under low pressure and azeotroped several times with DCM to remove the Acetic acid. The side-chain-protected peptides were obtained as white solid.
Chemistry
Pharmaceutical Intermediates
Inhibitors/Agonists
Material Science
For Research Only
120K+ Compounds
Competitive Price
1-2 Day Shipping
