4-(Phenylsulfonyl)-4-lithiocyclopentene as a nucleophilic 2-pentene-1,5-dial synthetic equivalent. An aziridine-based synthetic approach to (−)-alstonerine
作者:Paul Cox、Donald Craig、Stephanos Ioannidis、Volker S. Rahn
DOI:10.1016/j.tetlet.2005.04.033
日期:2005.7
silyl dienol ether formation followed by completely stereoselective hetero-Diels–Alder reaction with monomeric formaldehyde gives a late-stage intermediate in a planned total synthesis of the macroline-related alkaloid (−)-alstonerine.
4-锂硫基-4-(苯磺酰基)环戊烯与L-色氨酸衍生的N-甲苯磺酰基氮丙啶的反应提供了加合物。环戊烯双键的氧化裂解产生一个二醛,该二醛进入酸催化的Pictet-Spengler型双环化反应生成四环醛。完全区域选择性的甲硅烷基二烯醇醚的形成,然后与单体甲醛的完全立体选择性的杂Diels-Alder反应,形成了与大分子相关的生物碱(-)-alstonerine的计划总合成中的后期中间体。