Triethylamine → t-Butyl 2-hydroxy-2-[(3R,4R)-3-phenylacetamido-4-[(RS)-tetrahydropyran-2-ylcarbonylmethylthio]azetidin-2-on-1-yl]acetate

HRID 1421788Notes

Reaction equation

HRID 1421788 reaction equation
[C:1]1([CH2:7][C:8]([NH:10][C@H:11]2[C@@H:14]([S:15][CH2:16][C:17]([CH:19]3[CH2:24][CH2:23][CH2:22][CH2:21][O:20]3)=[O:18])[NH:13][C:12]2=[O:25])=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:26]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])(=[O:29])[CH:27]=[O:28].C(N(CC)CC)C.C(OCC)(=O)C>ClCCCl>[OH:28][CH:27]([N:13]1[C@H:14]([S:15][CH2:16][C:17]([CH:19]2[CH2:24][CH2:23][CH2:22][CH2:21][O:20]2)=[O:18])[C@H:11]([NH:10][C:8](=[O:9])[CH2:7][C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[C:12]1=[O:25])[C:26]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29]

Participants

6

Reactant 4

HCID 8471TriethylamineHCID 8857Ethyl AcetateHCID 10986247Tert-butyl 2-oxoacetateHCID 18396289HCID 18396289, compound

Product 1

HCID 18397160t-Butyl 2-hydroxy-2-[(3R,4R)-3-phenylacetamido-4-[(RS)-tetrahydropyran-2-ylcarbonylmethylthio]azetidin-2-on-1-yl]acetateYield 82%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent2×

Procedure

(3R,4R)-3-Phenylacetamido-4-[(RS)-tetrahydropyran-2-yl-carbonylmethylthio]azetidin-2-one (1.7 g) in 1,2-dichloroethane (20 ml) was successively treated with 0.5M t-butyl glyoxylate in 1,2-dichlorethane (10 ml) and triethylamine (50 mg, 70 μl) and monitored by t.l.c. (ethyl acetate) until no starting material remained. The reaction mixture was concentrated and flash chromatography (70% ethyl acetate in hexane, ethyl acetate) to afford the title compound as a yellow foam (1.9 g, 82%); νmax (CH2Cl3) 3400 (w), 1780, 1736, 1687 cm-1 ; δH (CDCl3) 1.49 (9H, s) overlapping 1.44-1.61 (4H, m), 1.8-2.0 (2H, m), 3.35-3.58 (3H, m), 3.65 (2H, s), 3.81-3.92 (1H, m), 4.01-4.06 (1H, m), 4.28-4.43 (1H, m), 4.99, 5.00, 5.07 (together 1H, 3d, J4.7 Hz), 5.21, 5.32, 5.33 (together 1H, 3d, J6.8, 7.7, 7.6 Hz), 5.42, 5.50 (together 1H, 2dd, J4.8, 8.7 Hz, 6.35, 6.36, 6.61 (together 1H, 3d, J8.7 Hz) and 7.27-7.38 (5H, m).

Workup

  1. concentrationThe reaction mixture was concentrated

Sources & evidence

ORD record
ord-3519d2157cec4acd902cf4f6a800a75c
Source dataset
uspto-grants-2000_06
Patent number
US06077952

Reaction notes

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