A simple, tandem approach to the construction of pyridine derivatives under metal-free conditions: a one-step synthesis of the monoterpene natural product, (−)-actinidine
作者:Dilipkumar Uredi、Damoder Reddy Motati、E. Blake Watkins
DOI:10.1039/c9cc01097a
日期:——
followed by concomitant cyclization through an allenyl intermediate to afford pyridines in excellent yields, with water as the sole by-product. This mild strategy is also suitable for functionalization of natural products or other advanced intermediates having α,β-unsaturated carbonyl functionality. The utility of the present protocol was showcased with the synthesis of the monoterpene alkaloid, (−)-actinidine
已经开发了一种简单的模块化单步合成法,可从容易获得的α,β-不饱和羰基化合物和炔丙基胺合成各种取代的吡啶。本方案具有广泛的底物范围,并允许在温和且无金属的条件下通过选择性控制取代模式来接近多取代的吡啶。该反应涉及亚胺的形成,随后伴随通过烯基中间体的环化,以优异的收率得到吡啶,其中水是唯一的副产物。这种温和的策略也适用于天然产物或其他具有α,β-不饱和羰基官能团的高级中间体的官能化。本协议的效用通过单蚁生物碱(-)-in啶,一种与蚂蚁相关的虹彩样生物的合成得以展示。