The racemic form of the title alkaloid, 1, has been prepared in 13 steps from the ring-fused gem-dibromocyclopropane 7. Key transformations include the thermally induced electrocyclic ring-opening of compound 7, the Pd[0]-catalyzed intramolecular Alder-ene (IMAE) reaction of the derived sulfonamide (±)-12, and the conversion of the ensuing C-3a-arylhexahydroindole (±)-16 into (±)-hamayne via a Pictet–Spengler
标题
生物碱1的外消旋体已从环稠合的宝石-二
溴环丙烷7历经13步制备。关键的转变包括化合物7的热诱导的电环开环,衍生的磺酰胺(±)-12的Pd [0]催化的分子内Alder-ene(IMAE)反应以及随后的C-3a-芳基六氢
吲哚的转化(±) - 16到(±)-haMAyne经由的Pictet-Spengler反应。