A short totalsynthesis, guided by biosynthetic considerations, of racemic merochlorin B is presented. The formation of its isomer, merochlorin A, was not observed under the conditions. Key steps include a directed ortho-metalation (DoM), a selective demethylation, an ortho-allylation, and an oxidative [3 + 2]-cycloaddition mediated by an iodine(III) reagent.
提出了短时间的全合成,受生物合成的考虑,外消旋的甲草绿素B。在这种条件下,未观察到其异构体,甲草绿素A的形成。关键步骤包括由碘(III)试剂介导的直接邻位金属化(D o M),选择性脱甲基,邻位烯丙基化和氧化性[3 + 2]环加成。