Acetic acid (2R,3S,4S,6S)-3-(tert-butyl-dimethyl-silanyloxy)-2-hydroxymethyl-6-phenylsulfanyl-tetrahydro-pyran-4-yl ester 在
N-溴代丁二酰亚胺(NBS) 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以80%的产率得到Acetic acid (1R,2S,3S,5R)-2-(tert-butyl-dimethyl-silanyloxy)-6,8-dioxa-bicyclo[3.2.1]oct-3-yl ester