摘要:
An efficient asymmetric synthesis of 3'-C-carbomethoxymethyl- 3'-deoxythymidine 2, using a highly stereocontrolled radical cyclization from bromoacetal 7 to furanose 8, followed by a dimethylboron bromide mediated nucleoside formation, is described. A 96:4 beta-selectivity was observed for thionoester-controlled base attachment.