Treatment of 5′-O-(tert-butyldiphenylsilyl)-2′(and 3′)-deoxy-2′(and 3′)-methyleneuridine (and adenosine) derivatives with phenyl chlorothionocarbonate gave the 3′(and 2′)-O-phenoxythiocarbonyl intermediates, which underwent spontaneous [3,3]-sigmatropic rearrangement to give the 2′,3′-didehydro-2′,3′-dideoxy-2′(and 3′)-(phenoxycarbonylthio)methyl analogues. These allylic thioesters were subjected to tributylstannane-mediated hydrodesulfurization and deprotection to give 2′,3′-didehydro-2′,3′-dideoxy-2′(and 3′)-methyluridine (and adenosine). Tributylstannane-mediated hydrodehalogenation of a 2′-chloro-2′,3′-dideoxy-3′-methyleneuridine derivative afforded the 2′,3′-didehydro-2′,3′-dideoxy-3′-methyl product of allylic transposition exclusively.
对5'-O-(叔丁基二苯基
硅基)-2'(和3')-去氧-2'(和3')-亚甲基
尿苷(和
腺苷)衍
生物进行苯基
氯硫代
碳酸酯处理,得到3'(和2')-O-苯氧
硫酰中间体,这些中间体经历自发的[3,3]-sigmatropic重排反应,产生2',3'-二去氢-2',3'-二去氧-2'(和3')-(苯氧羰基硫)甲基类似物。这些烯丙基
硫酯经过三
丁基锡介导的脱
硫化和去保护作用,得到2',3'-二去氢-2',3'-二去氧-2'(和3')-甲基
尿苷(和
腺苷)。对2'-
氯-2',3'-二去氧-3'-亚甲基
尿苷衍
生物进行三
丁基锡介导的脱卤化反应,仅得到烯丙基转位的2',3'-二去氢-2',3'-二去氧-3'-甲基产物。