Morpholine → p-Nitrobenzyl alpha-[4-cyclopropylmethoxycarbonylthio-3-phenoxyacetamido-2-oxoazetidin-1-yl]-alpha-(1-morpholinoethylidene)acetate
Reaction equation
[CH:1]1([CH2:4][O:5][C:6]([S:8][CH:9]2[N:12]([C:13](=[C:27](OS(C)(=O)=O)[CH3:28])[C:14]([O:16][CH2:17][C:18]3[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][CH:19]=3)=[O:15])[C:11](=[O:34])[CH:10]2[NH:35][C:36](=[O:45])[CH2:37][O:38][C:39]2[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=2)=[O:7])[CH2:3][CH2:2]1.[NH:46]1[CH2:51][CH2:50][O:49][CH2:48][CH2:47]1>C1C=CC=CC=1>[CH:1]1([CH2:4][O:5][C:6]([S:8][CH:9]2[N:12]([C:13](=[C:27]([N:46]3[CH2:51][CH2:50][O:49][CH2:48][CH2:47]3)[CH3:28])[C:14]([O:16][CH2:17][C:18]3[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][CH:19]=3)=[O:15])[C:11](=[O:34])[CH:10]2[NH:35][C:36](=[O:45])[CH2:37][O:38][C:39]2[CH:40]=[CH:41][CH:42]=[CH:43][CH:44]=2)=[O:7])[CH2:3][CH2:2]1Participants
4
Procedure
To a solution of p-nitrobenzyl α-[4-cyclopropylmethoxycarbonylthio-3-phenoxyacetamido-2-oxoazetidin-1-yl]-α-(1-methanesulfonyloxyethylidene)acetate (1.12 g) in benzene (11 ml) is added morpholine (0.26 ml) under ice cooling, and the mixture is kept at 10° C. overnight. The reaction mixture is washed with water, dried, and evaporated under reduced pressure. Purification of the obtained residue (1 g) by chromatography over silica gel (10 g) using a mixture of benzene and ethyl acetate (1:2) gives p-nitrobenzyl α-[4-cyclopropylmethoxycarbonylthio-3-phenoxyacetamido-2-oxoazetidin-1-yl]-α-(1-morpholinoethylidene)acetate