The Chiron Approach to Pironetins: Synthesis of the <i>δ</i>‐Lactonic Fragment and Modified Building Blocks from D‐Glucal
作者:Francisco Sarabia、Miguel García‐Castro、Samy Chammaa、Antonio Sánchez‐Ruiz
DOI:10.1080/07328300600735090
日期:2006.5.1
Abstract The synthesis of the δ‐lactonic fragment of pironetin (1), a natural product with outstanding antimitotic properties, is reported. The synthesis was achieved from commercially available tri‐O‐acetyl‐D‐glucal (6) that was employed as starting material for the preparation of ethyl ketone 4, through a synthetic sequence that included a Ferrier rearrangement of 6 and suitable functional group
摘要报道了具有卓越抗有丝分裂特性的天然产物吡咯丁酮(1)的δ-内酰胺酸片段的合成。合成是通过市售的三-O-乙酰基-D-葡萄糖(6)用作制备乙基酮4的原料,通过包括6的Ferrier重排和适当的官能团操作的合成序列完成的。得到的O-糖苷7与一系列的4-C-烷基修饰衍生物一起获得4-乙基糖苷11。4的合成完成是通过引入腈基并随后还原,用乙基溴化镁进行亲核攻击,最后氧化所得醇20来在C-6上进行链延长来完成的。