Stereoselective preparation of 6β -substituted penicillanates
作者:D.Ivor John、Nicholas D. Tyrrell、Eric J. Thomas
DOI:10.1016/s0040-4020(01)92141-6
日期:1983.1
6β-methoxycarbonylethyl-, 6β-(t-butoxycarbonylmethyl)-, and 6β-methylthiopenicillanates 10–15 have been prepared stereo-selectively by tri-n-butyltinhydridereduction of the corresponding 6β-isocyanopenicillanates 4–9 A minor side-product (15%) isolated from the reduction of benzyl 6α-(2-hydroxyprop-2-yl)-6β-isocyanopenicillanate 5 was identified as (1R, 5R)-6-[(1R)-1-benzyloxycarbonyl-2-methylprop-1