Gold-Catalyzed [4+2]- and [3+3]-Annulations of Ynamides with 1-Yn-3-ols to Access Six-Membered Carbocycles and Oxacycles <i>via</i>
Three Distinct Cyclizations
作者:Sovan Sundar Giri、Rai-Shung Liu
DOI:10.1002/adsc.201700784
日期:2017.10.4
and 1‐yn‐3‐ols are described; the resulting carbo‐ and heterocycles were produced efficiently in one‐pot operations using a gold catalyst. The chemoselectivities of these annulations are controlled by variations of the substituents of the ynamides and the 1‐yn‐3‐ols. This reaction sequence involves initial alkoxylations of ynamides, followed by Claisen rearrangement of propargylic enol ethers, and ends
描述了三种不同的催化酰胺和1-yn-3-ols催化环化的策略;在使用金催化剂的一锅操作中有效地生产了碳和杂环。这些环空的化学选择性受炔基和1–yn–3–ol取代基的变化控制。该反应顺序包括ynamides的初始烷氧基化,随后炔烯醇醚的Claisen重排,并结束与6-内-三角函数的1-丙二烯基-5-酰胺中间体的环化反应。在这些级联环中,5-烯基-1-酰胺的环化生成5,6-二氢-2-吡喃酮和6-亚烷基环己基-2-烯-1-羧酰胺在文献中是空前的。