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

HRID 376562Notes

Reaction equation

HRID 376562 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 (1.7g) in 1,2-dichloroethane (20ml) was successively treated with 0.5M t-butyl glyoxylate in 1,2-dichlorethane (10ml) and triethylamine (50mg, 70μl) 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 (1.9g, 82%); vmax (CH2Cl3) 3400 (w), 1780, 1736, 1687cm-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, J4.7Hz), 5.21, 5.32, 5.33 (together 1H, 3d, J6.8, 7.7, 7.6Hz), 5.42, 5.50 (together 1H, 2dd, J4.8, 8.7Hz, 6.35, 6.36, 6.61 (together 1H, 3d, J8.7Hz) and 7.27-7.38 (5H, m).

Workup

  1. concentrationThe reaction mixture was concentrated

Sources & evidence

ORD record
ord-cb2c78d839fd4278b728326bf1f6688d
Source dataset
uspto-grants-2000_02
Patent number
US06020329

Reaction notes

Loading…