Batch and Flow Photochemical Benzannulations Based on the Reaction of Ynamides and Diazo Ketones. Application to the Synthesis of Polycyclic Aromatic and Heteroaromatic Compounds
作者:Thomas P. Willumstad、Olesya Haze、Xiao Yin Mak、Tin Yiu Lam、Yu-Pu Wang、Rick L. Danheiser
DOI:10.1021/jo402010b
日期:2013.11.15
compounds are produced via a two-stage tandem benzannulation/cyclization strategy. The initial benzannulation step proceeds via a pericyclic cascade mechanism triggered by thermal or photochemical Wolff rearrangement of a diazo ketone. The photochemical process can be performed using a continuous flow reactor which facilitates carrying out reactions on a large scale and minimizes the time required for
高度取代的多环芳香族和杂芳香族化合物是通过两阶段串联苯并环化/环化策略生产的。最初的苯环化步骤通过由重氮酮的热或光化学沃尔夫重排触发的周环级联机制进行。光化学过程可以使用连续流动反应器进行,这有助于大规模进行反应并最大限度地减少光解所需的时间。碳甲氧基 ynamides 以及更亲烯酮的双甲硅烷基 ynamines 和N-磺酰基和N-磷酰基酰胺作为苯并环化步骤中的反应伙伴。在该策略的第二阶段,RCM 生成苯并稠合氮杂环,并且各种杂环化过程提供了使用先前基于环丁烯酮的串联策略版本无法获得的类型的高度取代和多环吲哚。