Diversity-Oriented Approach Toward the Syntheses of <i>Amaryllidaceae</i> Alkaloids via a Common Chiral Synthon
作者:Prachi Verma、Atish Chandra、Ganesh Pandey
DOI:10.1021/acs.joc.8b01368
日期:2018.9.7
a divergent route for the synthesis of these natural products. This is established in a few steps, starting from a chiral aza-bicyclo-heptene sulfone scaffold (2) via conjugate addition and concomitant stereoselective ring opening with allylmagnesium bromide, a key step that generates a crucial quaternary stereocenter, fixing the stereochemistry of the rest of the molecule at an early stage. One carbon
功能化的氢吲哚(1),一种常见的手性合成子,可进行多种转化,以合成多种金莲花科生物碱(AAs),包括(-)-可瑞宁,(-)-可瑞那,(-)-阿比林,(+)-中膜,报道了(-)-马里替丁,(-)-奥马替丁和(+)-膜。支架1被发现是各种AA中的主要结构基序,并且是设计合成这些天然产物的不同途径的新型合成子。这是从手性氮杂-双环庚烯砜骨架开始的几个步骤中建立的(2)通过烯丙基溴化镁的共轭加成和伴随的立体选择性开环,这是一个关键步骤,可生成至关重要的季立体中心,并在早期固定分子其余部分的立体化学。一碳截短,然后进行分子内还原性胺化,以克为单位产生了所需的核1。