Alcaloides monoterpéniques III: Synthese stéréospésifique de la (±) épi-7,7a técomanine
作者:Jean-Pierre Alazard、Anne Leboff、Claude Thal
DOI:10.1016/s0040-4020(01)96207-6
日期:1991.11
The presence of a borane axial group in compound 14 induces a regio and stereospecific 1O2 cycloaddition at low temperature. This selectivity together with that obtained during the lithium liquid ammonia reduction of the 4aβ-hydroxyenone 6, allows a short and stereospecific synthesis of the (±) epi-7,7a tecomanine 5, an unnatural and undescribed isomer of the tecomanine 1.
化合物14中硼烷轴向基团的存在在低温下诱导区域和立体特异性的1 O 2环加成。这种选择性与在4aβ-羟基烯酮6的锂液氨还原过程中获得的选择性一起,可以实现(±)epi-7,7a tecomanine 5(tecomanine 1的一种非天然且未描述的异构体)的短而立体有择的合成。
Photooxydation d'un aminodiene et d'aminodiene-boranes