(-)-(3'R,5'S,8'R)-diphenylcarbamic acid 2-acetylamino-9-(8'-allyloxy-7'-oxa-[3.3.0]-bicyclooct-1'-ene-3'-yl)-9H-purin-6-yl ester 在
4-甲基苯磺酸吡啶 作用下,
以
丙酮 为溶剂,
反应 3.0h,
生成 Diphenyl-carbamic acid 2-acetylamino-9-((1R,4S)-3-formyl-4-hydroxymethyl-cyclopent-2-enyl)-9H-purin-6-yl ester