[CH3:1][S-:2].[Na+].[CH2:4]([O:6][C:7](=[O:27])[N:8]([C:16]1[CH:21]=[C:20](Cl)[N:19]=[C:18]([NH2:23])[C:17]=1[N+:24]([O-:26])=[O:25])[CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[CH3:5]>CO.C1COCC1.CO>[CH2:4]([O:6][C:7](=[O:27])[N:8]([C:16]1[CH:21]=[C:20]([S:2][CH3:1])[N:19]=[C:18]([NH2:23])[C:17]=1[N+:24]([O-:26])=[O:25])[CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[CH3:5]Sodium methanethiolate (180 mg) was added portion-wise to a stirred suspension of (2-amino-6-chloro-3-nitro-pyridin-4-yl)-benzyl-carbamic acid ethyl ester (300 mg) in methanol:THF (3:1, 4 ml). The mixture was sealed in a ReactiVial then left to stir at room temperature for 2 hours. The reaction mixture was diluted with methanol then pre-absorbed directly onto silica gel. The crude was columned on Isco Companion on a silica column (12 g, Redisep), eluting with EtOAc:heptane, increasing the gradient linearly from 30:70 to 50:50 over 6 column volumes. The desired fractions were combined and evaporated to provide the title compound (297 mg) as a yellow gum.
Wird geladen…