Development of Gold-catalyzed [4+1] and [2+2+1]/[4+2] Annulations between Propiolate Derivatives and Isoxazoles
作者:Rajkumar Lalji Sahani、Rai-Shung Liu
DOI:10.1002/anie.201610665
日期:2017.1.19
new gold‐catalyzed annulations of isoxazoles with propiolates have been developed. Most isoxazoles follow an initial O attack on the alkyne to afford a [4+1] annulation product. This process results in a remarkable alkyne cleavage of initial propiolates. Unsubstituted isoxazoles proceed through an N attack step to yield formal [2+2+1]/[4+2] annulation products. These two annulation products arise initially
已经开发了两种新的金催化的异恶唑与丙酸酯的环。大多数异恶唑在对炔烃进行初始O攻击后,即可得到[4 + 1]环化产物。该过程导致初始丙酸酯的显着炔烃裂解。未取代的异恶唑通过N攻击步骤进行操作,得到正式的[2 + 2 + 1] / [4 + 2]环化产物。这两个环空产物最初来自两个七元杂环中间体,然后形成产物。