Concise synthetic route to both enantiomeric forms of 2,3,4,4a-tetrahydro[1,3]dioxolo[4,5-j]phenanthridin-6(5H)-one, the tetracyclic skeleton associated with the narcissus alkaloids lycoricidine and narciclasine
作者:Martin G. Banwell、Cameron J. Cowden、Maureen F. Mackay
DOI:10.1039/c39940000061
日期:——
Both enantiomeric forms, (S)-4 and (R)-4, of the tetracyclic skeleton associated with the title alkaloids 1 and 2 have been prepared; the key step involved silver isocyanate-promoted ring-opening of gem-dibromocyclopropane 5 and trapping of the resulting allylic isocyanate (±)-6 with (–)-menthol.
与标题生物碱1和2相关的四环骨架的两种对映体形式(S)-4和(R)-4已被制备;关键步骤涉及异氰酸银促进宝石-二溴环丙烷 5 的开环,并用 (–)-薄荷醇捕获生成的烯丙基异氰酸酯 (±)-6。