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Chemical Structure| 50607-30-2 Chemical Structure| 50607-30-2

Structure of 50607-30-2

Chemical Structure| 50607-30-2

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Product Details of [ 50607-30-2 ]

CAS No. :50607-30-2
Formula : C5H7NO2
M.W : 113.11
SMILES Code : N1CCC(CC1=O)=O
MDL No. :MFCD08704814
InChI Key :RDNZDMDLRIQQAX-UHFFFAOYSA-N
Pubchem ID :10887863

Safety of [ 50607-30-2 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Computational Chemistry of [ 50607-30-2 ] Show Less

Physicochemical Properties

Num. heavy atoms 8
Num. arom. heavy atoms 0
Fraction Csp3 0.6
Num. rotatable bonds 0
Num. H-bond acceptors 2.0
Num. H-bond donors 1.0
Molar Refractivity 31.15
TPSA ?

Topological Polar Surface Area: Calculated from
Ertl P. et al. 2000 J. Med. Chem.

46.17 Ų

Lipophilicity

Log Po/w (iLOGP)?

iLOGP: in-house physics-based method implemented from
Daina A et al. 2014 J. Chem. Inf. Model.

0.68
Log Po/w (XLOGP3)?

XLOGP3: Atomistic and knowledge-based method calculated by
XLOGP program, version 3.2.2, courtesy of CCBG, Shanghai Institute of Organic Chemistry

-0.81
Log Po/w (WLOGP)?

WLOGP: Atomistic method implemented from
Wildman SA and Crippen GM. 1999 J. Chem. Inf. Model.

-0.92
Log Po/w (MLOGP)?

MLOGP: Topological method implemented from
Moriguchi I. et al. 1992 Chem. Pharm. Bull.
Moriguchi I. et al. 1994 Chem. Pharm. Bull.
Lipinski PA. et al. 2001 Adv. Drug. Deliv. Rev.

-0.89
Log Po/w (SILICOS-IT)?

SILICOS-IT: Hybrid fragmental/topological method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

0.96
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

-0.2

Water Solubility

Log S (ESOL):?

ESOL: Topological method implemented from
Delaney JS. 2004 J. Chem. Inf. Model.

-0.03
Solubility 105.0 mg/ml ; 0.931 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (Ali)?

Ali: Topological method implemented from
Ali J. et al. 2012 J. Chem. Inf. Model.

0.32
Solubility 236.0 mg/ml ; 2.09 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Highly soluble
Log S (SILICOS-IT)?

SILICOS-IT: Fragmental method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

-1.04
Solubility 10.3 mg/ml ; 0.0914 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Soluble

Pharmacokinetics

GI absorption?

Gatrointestinal absorption: according to the white of the BOILED-Egg

High
BBB permeant?

BBB permeation: according to the yolk of the BOILED-Egg

No
P-gp substrate?

P-glycoprotein substrate: SVM model built on 1033 molecules (training set)
and tested on 415 molecules (test set)
10-fold CV: ACC=0.72 / AUC=0.77
External: ACC=0.88 / AUC=0.94

No
CYP1A2 inhibitor?

Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.83 / AUC=0.90
External: ACC=0.84 / AUC=0.91

No
CYP2C19 inhibitor?

Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.80 / AUC=0.86
External: ACC=0.80 / AUC=0.87

No
CYP2C9 inhibitor?

Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set)
and tested on 2075 molecules (test set)
10-fold CV: ACC=0.78 / AUC=0.85
External: ACC=0.71 / AUC=0.81

No
CYP2D6 inhibitor?

Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set)
and tested on 1068 molecules (test set)
10-fold CV: ACC=0.79 / AUC=0.85
External: ACC=0.81 / AUC=0.87

No
CYP3A4 inhibitor?

Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set)
and tested on 2579 molecules (test set)
10-fold CV: ACC=0.77 / AUC=0.85
External: ACC=0.78 / AUC=0.86

No
Log Kp (skin permeation)?

Skin permeation: QSPR model implemented from
Potts RO and Guy RH. 1992 Pharm. Res.

-7.57 cm/s

Druglikeness

Lipinski?

Lipinski (Pfizer) filter: implemented from
Lipinski CA. et al. 2001 Adv. Drug Deliv. Rev.
MW ≤ 500
MLOGP ≤ 4.15
N or O ≤ 10
NH or OH ≤ 5

0.0
Ghose?

Ghose filter: implemented from
Ghose AK. et al. 1999 J. Comb. Chem.
160 ≤ MW ≤ 480
-0.4 ≤ WLOGP ≤ 5.6
40 ≤ MR ≤ 130
20 ≤ atoms ≤ 70

None
Veber?

Veber (GSK) filter: implemented from
Veber DF. et al. 2002 J. Med. Chem.
Rotatable bonds ≤ 10
TPSA ≤ 140

0.0
Egan?

Egan (Pharmacia) filter: implemented from
Egan WJ. et al. 2000 J. Med. Chem.
WLOGP ≤ 5.88
TPSA ≤ 131.6

0.0
Muegge?

Muegge (Bayer) filter: implemented from
Muegge I. et al. 2001 J. Med. Chem.
200 ≤ MW ≤ 600
-2 ≤ XLOGP ≤ 5
TPSA ≤ 150
Num. rings ≤ 7
Num. carbon > 4
Num. heteroatoms > 1
Num. rotatable bonds ≤ 15
H-bond acc. ≤ 10
H-bond don. ≤ 5

1.0
Bioavailability Score?

Abbott Bioavailability Score: Probability of F > 10% in rat
implemented from
Martin YC. 2005 J. Med. Chem.

0.55

Medicinal Chemistry

PAINS?

Pan Assay Interference Structures: implemented from
Baell JB. & Holloway GA. 2010 J. Med. Chem.

0.0 alert
Brenk?

Structural Alert: implemented from
Brenk R. et al. 2008 ChemMedChem

1.0 alert: heavy_metal
Leadlikeness?

Leadlikeness: implemented from
Teague SJ. 1999 Angew. Chem. Int. Ed.
250 ≤ MW ≤ 350
XLOGP ≤ 3.5
Num. rotatable bonds ≤ 7

No; 1 violation:MW<1.0
Synthetic accessibility?

Synthetic accessibility score: from 1 (very easy) to 10 (very difficult)
based on 1024 fragmental contributions (FP2) modulated by size and complexity penaties,
trained on 12'782'590 molecules and tested on 40 external molecules (r2 = 0.94)

1.0

Application In Synthesis of [ 50607-30-2 ]

* 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.

  • Downstream synthetic route of [ 50607-30-2 ]

[ 50607-30-2 ] Synthesis Path-Downstream   1~55

  • 1
  • [ 74030-92-5 ]
  • [ 50607-30-2 ]
  • [ 74031-07-5 ]
  • 2
  • [ 99-61-6 ]
  • [ 14205-39-1 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(3-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 3
  • [ 99-61-6 ]
  • [ 41867-20-3 ]
  • [ 50607-30-2 ]
  • 3-carboethoxy-2-methyl-5-oxo-4-(3-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 4
  • [ 86-81-7 ]
  • [ 14205-39-1 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 5
  • [ 86-81-7 ]
  • [ 41867-20-3 ]
  • [ 50607-30-2 ]
  • 3-carboethoxy-2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 6
  • [ 86-81-7 ]
  • [ 24392-27-6 ]
  • [ 50607-30-2 ]
  • 3-N-methylaminocarbonyl-2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 7
  • [ 86-81-7 ]
  • (E)-3-Amino-but-2-enoic acid (2-hydroxy-ethyl)-amide [ No CAS ]
  • [ 50607-30-2 ]
  • 3-N-(2-hydroxyethyl)aminocarbonyl-2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 8
  • [ 86-81-7 ]
  • β-amino-N,N-diethylcrotonamide [ No CAS ]
  • [ 50607-30-2 ]
  • 3-N,N-diethylaminocarbonyl-2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 9
  • [ 14205-39-1 ]
  • [ 6334-18-5 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(2,3-dichlorophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 10
  • [ 14205-39-1 ]
  • [ 100-10-7 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(4-N-dimethylaminophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 11
  • [ 14205-39-1 ]
  • [ 552-89-6 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(2-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 12
  • [ 6628-86-0 ]
  • [ 14205-39-1 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(2-nitro-5-chlorophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 13
  • [ 14205-39-1 ]
  • [ 157701-72-9 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(2-fluoro-4-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 14
  • [ 41867-20-3 ]
  • [ 6334-18-5 ]
  • [ 50607-30-2 ]
  • 3-carboethoxy-2-methyl-5-oxo-4-(2,3-dichlorophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 15
  • [ 41867-20-3 ]
  • [ 552-89-6 ]
  • [ 50607-30-2 ]
  • 3-carboethoxy-2-methyl-5-oxo-4-(2-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 16
  • [ 39562-27-1 ]
  • [ 50607-30-2 ]
  • 3-carbomethoxy-2-methyl-5-oxo-4-(2-nitrophenyl)-1,4,5,6,7,8-hexahydro-pyrido<4,3-b>pyridine [ No CAS ]
  • 17
  • [ 89159-00-2 ]
  • [ 50607-30-2 ]
  • 5-(6-Oxo-1,2,3,6-tetrahydro-pyridin-4-ylamino)-1-pentyl-1H-pyrazole-4-carbonitrile [ No CAS ]
  • 18
  • [ 77771-02-9 ]
  • [ 265321-06-0 ]
  • [ 50607-30-2 ]
  • 10-(3-bromo-4-fluorophenyl)-3,4,6,10-tetrahydro-2H-pyrano[3,4-b][1,6]naphthyridine-1,9(5H,8H)-dione [ No CAS ]
  • 19
  • [ 5220-49-5 ]
  • [ 77771-02-9 ]
  • [ 50607-30-2 ]
  • 10-(3-bromo-4-fluoro-phenyl)-3,4,6,7,8,10-hexahydro-2<i>H</i>,5<i>H</i>-benzo[<i>b</i>][1,6]naphthyridine-1,9-dione [ No CAS ]
  • 20
  • [ 28566-12-3 ]
  • [ 77771-02-9 ]
  • [ 50607-30-2 ]
  • 9-(3-bromo-4-fluoro-phenyl)-3,4,5,6,7,9-hexahydro-2<i>H</i>-cyclopenta[<i>b</i>][1,6]naphthyridine-1,8-dione [ No CAS ]
  • 21
  • [ 77771-02-9 ]
  • [ 50607-30-2 ]
  • 9-(3-bromo-4-fluoro-phenyl)-3,4,6,7,9,10-hexahydro-2<i>H</i>,5<i>H</i>-2,7,10-triaza-anthracene-1,8-dione [ No CAS ]
  • 22
  • 2-bromo-1-(2-chloro-4-pyridinyl)-ethanone hydrobromide [ No CAS ]
  • [ 50607-30-2 ]
  • [ 724726-05-0 ]
YieldReaction ConditionsOperation in experiment
47.5% With ammonium acetate; In ethanol; at 20℃; for 2h; To a round bottom flask charged with 3A (6.06 g, 19.21 mmol), <strong>[50607-30-2]piperidine-2,4-dione</strong> (2.391 g, 21.14 mmol), ammonium acetate (5.92 g, 77 mmol) and ethanol (64.0 ml) were added. The reaction mixture was stirred at rt for 2 h. Water (20 ml) was added and stirring was continued for 3 h. The product was collected via filtration. The collected solid was washed with water and dried under vacuum ON, yielding 3B (2.26 g, 9.12mmol, 47.5percent yield) as a white solid. MS(ES+) m/z 248.0 (M+H).
  • 23
  • sodium 3-(methoxycarbonyl)-4-oxo-1,4,5,6-tetrahydropyridin-2-olate [ No CAS ]
  • [ 50607-30-2 ]
YieldReaction ConditionsOperation in experiment
10.8 g With hydrogenchloride; for 3h;Reflux; (3) decarboxylation: to in the intermediate product to B 1mol/L hydrochloric acid of 80g, and then the reaction liquid heating reflux 3h, TLC detection after the reaction is complete, distilled concentrated mother liquor, cooling separating white crystal 2,4-piperidine dione, drying weighing to 10.8 g, computing the yield is 64percent.
  • 24
  • [ 5349-17-7 ]
  • [ 50607-30-2 ]
  • [ 845714-00-3 ]
  • 25
  • [ 50607-30-2 ]
  • C17H14N4O [ No CAS ]
  • 26
  • [ 50607-30-2 ]
  • C17H14N4O [ No CAS ]
  • 27
  • [ 50607-30-2 ]
  • C16H13N5O [ No CAS ]
  • 28
  • [ 50607-30-2 ]
  • C16H13N3OS [ No CAS ]
  • 29
  • [ 50607-30-2 ]
  • C22H17N3O [ No CAS ]
  • 30
  • [ 50607-30-2 ]
  • C20H15N3OS [ No CAS ]
  • 31
  • [ 50607-30-2 ]
  • 2-(2-quinolin-3-ylpyridin-4-yl)-1,5,6,7-tetrahydro-4H-pyrrolo[3,2-c]pyridin-4-one [ No CAS ]
  • 32
  • [ 50607-30-2 ]
  • C18H15N3O2 [ No CAS ]
  • 33
  • [ 50607-30-2 ]
  • C18H15N3O2 [ No CAS ]
  • 34
  • [ 50607-30-2 ]
  • C18H15N3O2 [ No CAS ]
  • 35
  • [ 50607-30-2 ]
  • C18H14ClN3O [ No CAS ]
  • 36
  • [ 50607-30-2 ]
  • C18H14ClN3O [ No CAS ]
  • 37
  • [ 50607-30-2 ]
  • C18H14ClN3O [ No CAS ]
  • 38
  • [ 50607-30-2 ]
  • PH-089 [ No CAS ]
  • 39
  • [ 50607-30-2 ]
  • C18H14FN3O [ No CAS ]
  • 40
  • [ 50607-30-2 ]
  • C18H14FN3O [ No CAS ]
  • 41
  • [ 50607-30-2 ]
  • C19H14F3N3O [ No CAS ]
  • 42
  • [ 50607-30-2 ]
  • C19H14N4O [ No CAS ]
  • 43
  • [ 50607-30-2 ]
  • C20H17N3O2 [ No CAS ]
  • 44
  • [ 50607-30-2 ]
  • C19H17N3O2 [ No CAS ]
  • 45
  • [ 50607-30-2 ]
  • C18H16N4O [ No CAS ]
  • 46
  • [ 50607-30-2 ]
  • C19H15N3O3 [ No CAS ]
  • 47
  • [ 50607-30-2 ]
  • C22H20N4O2 [ No CAS ]
  • 48
  • [ 50607-30-2 ]
  • C24H24N4O2 [ No CAS ]
  • 49
  • [ 50607-30-2 ]
  • C25H26N4O2 [ No CAS ]
  • 50
  • [ 50607-30-2 ]
  • C26H22N4O2 [ No CAS ]
  • 51
  • [ 50607-30-2 ]
  • C18H15N3O [ No CAS ]
  • 52
  • [ 50607-30-2 ]
  • 4-Amino-7,8-dihydro-1-pentyl-1H-pyrazolo<3,4-b><1,6>naphthyridin-5(6H)-one [ No CAS ]
  • 53
  • [ 845267-57-4 ]
  • [ 50607-30-2 ]
  • 2-(pyrimidin-4-yl)-1,5,6,7-tetrahydro-4H-pyrrolo[3,2-c]pyridin-4-one hydrochloride [ No CAS ]
YieldReaction ConditionsOperation in experiment
52% Example 13 2-PYRIMIDIN-4-YT-1, 5, 6, 7-TETRAHYDRO-4H-PYRROLO JL 3, 2-CIPVRIDIN-4-O. NE HYD ROCHLORIDE 2-BROMO-1-PYRIMIDIN-4-YLETHANONE hydrobromide (67 mg, 0.239 MMOLS), <strong>[50607-30-2]piperidine-2,4-dione</strong> (50 mg, 0.358 MMOLS) and ammonium acetate (74 mg, 0.957 MMOLS) were dissolved in anhydrous ethanol (1 mL) and stirred at r. t. overnight. The reaction mixture was concentrated to dryness under reduced pressure and the residue was taken up with water (1 mL) and filtered; the solid was washed with cold water and dried. To the obtained brown solid (30 mg) dissolved in MEOH (15 mL), 4N HCI in dioxane (0.5 mL) was added and the mixture was stirred for 30 minutes and then concentrated under reduced pressure to half of the volume. The obtained precipitate was filtered, washed with ethyl acetate and dried to give the title compound as a yellow solid (31 mg, Y=52percent).
  • 54
  • methyl-3-aninocrotonate [ No CAS ]
  • [ 77771-02-9 ]
  • [ 50607-30-2 ]
  • 4-(3-bromo-4-fluorophenyl)-3-(methoxycarbonyl)-2-methyl-4,6,7,8-tetrahydro[1,6]naphthyridin-5(1H)-one [ No CAS ]
YieldReaction ConditionsOperation in experiment
60% In ethanol; EXAMPLE 31A 4-(3-bromo-4-fluorophenyl)-3-(methoxycarbonyl)-2-methyl-4,6,7,8-tetrahydro[1,6]naphthyridin-5(1H)-one The product from Example 1C (1.33 g, 11.8 mmol), 3-bromo-4-fluorobenzaldehyde (2.39 g, 11.8 mmol) and methyl-3-aninocrotonate (1.36 g, 11.8 mmol) in ethyl alcohol (30 mL) were stirred in a sealed tube at 75° C. for 24 hours. The reaction mixture was allowed to cool to ambient temperature and filtered to provide the title compound as a white solid (2.27 g). The filtrate was concentrated and flash chromatographed (silica, ethyl acetate:dichloromethane:methyl alcohol, 4:1:0 to 7:0:1) to provide an additional amount of the title compound (0.54 g, 60percent combined yield). mp 150-152° C.; MS (ESI+) m/z 395 (M+H)+; 1H NMR (DMSO-d6) delta8.99 (s, 1H), 7.36 (dd, 1H, J=6.9, 2.1 Hz), 7.22 (dd, 1H, J=8.4, 8.4 Hz), 7.16 (ddd, 1H, J=8.4, 5.1, 2.1 Hz), 6.96 (br s, 1H), 4.90 (s, 1H), 3.52 (s, 3H), 3.19-3.11 (m, 2H), 2.45-2.33 (m, 2H), 2.29 (s, 3H); Anal. Calcd for C17H16N2O3FBr: C, 51.66; H, 4.08; N, 7.09. Found: C, 51.82; H, 4.37; N, 6.90.
  • 55
  • methyl 2,4-dioxopiperidine-3-carboxylate [ No CAS ]
  • [ 50607-30-2 ]
YieldReaction ConditionsOperation in experiment
90% With water; In acetonitrile; for 4h;Heating / reflux; EXAMPLE ; Preparation of piperidine-2,4-dione; A solution of mu-alanine ethylester hydrochloride (13.8 g, 90mmol) in dichloromethane (90 mL) and TEA (13.8 mL, 99 mmol) was stirred at RT for one hour. More TEA (13.8 mL, 99 mmol) was added, the solution was cooled to 0° C. under stirring and ethylmalonylchloride (12.6 mL, 99 mmol) was added dropwise. After one hour at 0° C., the reaction mixture was stirred one hour at RT. A 15percent aqueous solution of K2CO3 (90 mL) was added and the layers were separated. The organic phase was washed with 10percent HCl (90 mL), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material was chromatographed on flash silica gel (450 g, eluant: ethyl acetate/n-hexane 2:1) to give N-(2-ethoxycarbonyl-ethyl)-malonamic acid ethyl ester as a yellow oil (15 g, 64.9 mmol, 72percent yield). TLC: DCM/MeOH 20:1, iodine vapours. Sodium metal (610 mg, 26.6 mmol) was dissolved in dry MeOH (25 mL) at RT under stirring and inert atmosphere. After complete dissolution the mixture was stirred 10' longer, then N-(2-ethoxycarbonyl-ethyl)-malonamic acid ethyl ester (6.15 g, 26.6 mmol) in dry toluene (150 mL) is added dropwise. After addition the reaction mixture was stirred at 90° C. for 6 hours, cooled to RT, water (30 mL) was added and the layers were separated. The organic phase was washed with water (2.x.10 mL), the joined aqueous phases were acidified with 37percent HCl and extracted thoroughly (.x.20 or more) with a mixture of DCM/MeOH (5:1). After drying over Na2SO4 and concentration, 3-methoxycarbonylpiperidin-2,4-dione as a pink solid was obtained (4 g, 23.4 mmol, 88percent yield). 3-Methoxycarbonylpiperidin-2,4-dione (4 g, 23.4 mmol) is dissolved in acetonitrile containing 1percent of water (250 mL) and refluxed 4 hours. The reaction mixture is concentrated to give piperidine-2,4-dione, as a yellow solid (2.4 g, 21.2 mmol, 90percent yield). 1H NMR (400 MHz, DMSO-D6) delta ppm 2.43-2.49 (m, 2 H) 3.24 (s, 2 H) 3.28-3.45 (m, 2 H) 8.07 (s, 1 H).
90% In water; acetonitrile; for 4h;Heating / reflux;Product distribution / selectivity; A solution of beta-alanine ethylester hydrochloride (13.8 g, 90 mmol) in dichloromethane (90 ml.) and triethylamine (TEA, 13.8 ml_, 99 mmol) was stirred at room temperature for 1 hour. More TEA (13.8 ml_, 99 mmol) was added, the solution was cooled to 00C under stirring and ethylmalonylchloride (12.6 ml_, 99 mmol) was added dropwise. After 1 hour at 00C, the reaction mixture was stirred 1 hour at room temperature. A 15percent aqueous solution of K2CO3 (90 ml.) was added and the layers were separated. The organic phase was washed with 10percent HCI (90 ml_), dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material was chromatographed on flash silica gel (450 g, eluant: ethyl acetate/n-hexane 2:1 ) to give N-(2-ethoxycarbonyl-ethyl)-malonamic acid ethyl ester as a yellow oil (15 g, 64.9 mmol, 72percent yield). Sodium metal (610 mg, 26.6 mmol) was dissolved in dry MeOH (25 ml.) at room temperature under stirring and inert atmosphere. After complete dissolution the mixture was stirred 10' longer, then N-(2-ethoxycarbonyl-ethyl)-malonamic acid ethyl ester (6.15 g, 26.6 mmol) in dry toluene (150 ml.) was added dropwise. After addition, the reaction mixture was stirred at 900C for 6 hours, cooled to room temperature, water (30 ml.) was added and the layers were separated. The organic phase was washed with water (2x10 ml_), the combined aqueous phases were acidified with 37percent HCI and extracted thoroughly with a mixture of DCM/MeOH (5:1 ). After drying over Na2SO4 and concentration, 3-methoxycarbonylpiperidin-2,4-dione as a pink solid was obtained (4 g, 88percent yield). 3-Methoxycarbonylpiperidin-2,4-dione (4 g, 23.4 mmol) was dissolved in acetonitrile containing 1percent of water (250 ml.) and refluxed for 4 hours. The reaction mixture was concentrated to give the title compound, as a yellow solid (2.4 g, 90percent yield). 1 H NMR (400 MHz, DMSO-D6) delta ppm 2.43 - 2.49 (m, 2 H) 3.24 (s, 2 H) 3.28 - 3.45 (m,2 H) 8.07 (s, 1 H).
27% With water; In acetonitrile; at 86℃; for 4h; Step 3 Piperidine-2,4-dione: 2,4-Dioxo-piperidine-3-carboxylic acid methyl ester (400 mg, 2.34 mmol, 1.00 equiv) was dissolved in acetonitrile (20 mL)/water (0.2 mL). The resulting mixture was heated at about 86° C. for about 4 hours, and then concentrated in vacuo. The resulting residue was purified by silica gel column chromotagraphy (dichloromethane/methanol (100:1)) to give the title product as a white solid (70 mg, yield=27percent). LC-MS: m/z=114 (MH)+.
In acetonitrile; EXAMPLE 1C 2,4-piperidinedione The product from Example 1B (1.21 g, 7.08 mmol) was dissolved in a large volume of acetonitrile (1percent water). After refluxing for 2 hours, solution was concentrated to provide the title compound as a yellow solid (quantitative yield). MS (CI+) m/z 131 (M+NH4)+; 1H NMR (CDCl3) delta6.64 (br s, 1H), 3.58 (ddd, J=6.3, 6.0, 3.6 Hz, 2H), 3.34 (s, 2H), 2.64 (dd, J=6.3, 6.3 Hz, 2H).

 

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