[(2S,3S,6S)-6-Allyloxy-2-(tert-butyl-dimethyl-silanyloxymethyl)-3,6-dihydro-2H-pyran-3-yl]-acetic acid methyl ester 在
bromonium di-sym-collidine perchlorate 作用下,
以
氯仿 为溶剂,
反应 2.5h,
以8%的产率得到(3aR,4S,6S,7S,7aR)-6-Allyloxy-7-bromo-4-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furo[3,2-c]pyran-2-one