A new, efficient synthesis of racemic cyclopent-3-en-1-yl nucleoside analogues has been developed starting from cyclopentadiene. The key step is the regioselective hydroboration of an intermediately formed mixture of two alkylated cyclopentadienes to give one cyclopentenol. The remaining double bond was further functionalized by hydroboration, epoxidation, cis-hydroxylation and cyclopropanation.
已开发出一种新的高效合成方法,从环戊二烯出发合成了外消旋环戊-3-烯-1-基核苷类似物。关键步骤是对中间形成的两种烷基化环戊二烯混合物进行区域选择性氢硼化,得到一个环戊醇。剩余的双键进一步通过氢硼化、环氧化、顺式羟基化和环丙烷化进行官能化。