Nucleophilic openings of bicyclic β-lactones via acyl C–O and alkyl C–O cleavage: catalytic, asymmetric synthesis of a versatile, carbocyclic nucleoside precursor and protected transpentacin
作者:Yasuno Yokota、Guillermo S Cortez、Daniel Romo
DOI:10.1016/s0040-4020(02)00703-2
日期:2002.8
recently developed in our laboratory. These bicyclic β-lactones undergo facile ring cleavage under mild conditions via both acyl C–O and alkyl C–O bond cleavage. Cleavage of the acyl C–O bond with hydroxylamine nucleophiles proceeds at ambient temperature and reductive cleavage is readily accomplished with aluminum and boron reducing agents. Alternatively, alkyl C–O cleavage with various nucleophiles leads
通过我们实验室最近开发的分子内催化,不对称亲核试剂催化的醛醇内酯化反应,可得到多种与碳环融合的β-内酯。这些双环β-内酯在温和条件下会通过酰基C-O和烷基C-O键断裂而容易地断裂。酰基C–O键与羟胺亲核试剂的裂解在环境温度下进行,而还原性裂解可通过铝和硼还原剂轻松完成。另外,用各种亲核试剂进行的烷基C-O裂解会导致多种反式-β-取代的环戊烷羧酸。这些转化的效用通过保护的(1 S,2 S)-反戊酸和通用二醇,用于碳环核苷的合成。