(2R,3S,4R,5S)-2-benzyloxymethyl-8-(4-methoxybenzyl)-6-benzyloxycarbonyl-3,4-dihydroxy-1-oxa-6,8-diazaspiro<4,4>nonane-7,9-dione 、
N,N'-硫羰基二咪唑 以
甲苯 为溶剂,
反应 1.0h,
以69%的产率得到(2R,3R,4R,5S)-2-Benzyloxymethyl-6-benzyloxycarbonyl-8-(4-methoxybenzyl)-3,4-thiocarbonyldioxy-1-oxa-6,8-diazaspiro<4.4>nonane-7,9-dione