Total synthesis of (−)-kainic acid and (+)-allo-kainic acid through SmI<sub>2</sub>-mediated intramolecular coupling between allyl chloride and an α,β-unsaturated ester
作者:Junya Suzuki、Natsumi Miyano、Shunpei Yashiro、Taiki Umezawa、Fuyuhiko Matsuda
DOI:10.1039/c7ob01427a
日期:——
cyclized through SmI2-mediated reductive coupling between allyl chloride and an α,β-unsaturated ester, although little has been reported about SmI2-promoted C–C bond formation of an allyl chloride with an α,β-unsaturated ester. Selection of either the 3,4-cis- or 3,4-trans-selective cyclization can be accomplished simply by changing the additives from NiI2 to HMPA during reductive cyclization conducted in
通过SmI 2介导的烯丙基氯与α,β-不饱和酯之间的还原偶联,可将3,4-二取代的吡咯烷环有效地环化,尽管关于SmI 2促进烯丙基氯与C,C形成C-C键的报道很少。 α,β-不饱和酯。通过在H 2 O-THF中进行还原环化过程中,将添加剂从NiI 2改为HMPA,可以简单地选择3,4-顺式或3,4-反式选择性环化。(-)-海藻酸和(+)-别铝的全合成-海藻酸,是在神经科学和神经药理学中用作有用分子探针的吡咯烷生物碱,是通过使用SmI 2促进的立体互补闭环反应来构建2,3,4-三取代吡咯烷骨架的类胡萝卜素而成功实现的。