Single Bifunctional Ruthenium Catalyst for One-Pot Cyclization and Hydration giving Functionalized Indoles and Benzofurans
作者:Reji N. Nair、Paul J. Lee、Arnold L. Rheingold、Douglas B. Grotjahn
DOI:10.1002/chem.201001075
日期:2010.7.19
Bifunctional is more than twice as fun! At low loading, catalyst 1 (see scheme) can form two important heterocycle classes, apparently by attack of XH on a vinylidene intermediate. Aza‐ and nitroindoles can be formed, and all N‐protecting groups tested (alkyl, allyl, sulfonyl) were tolerated. The newly formed ring can be deuterated in one step, and for substrates with two terminal alkynes, cyclization
双功能是乐趣的两倍以上!在低负荷下,催化剂1(参见方案)可以形成两个重要的杂环类,显然是由于XH攻击亚乙烯基中间体。可以形成氮杂和硝基吲哚,并且可以耐受所有测试的N保护基(烷基,烯丙基,磺酰基)。新形成的环可在一个步骤中完成氘代反应,对于带有两个末端炔烃的底物,环化后可进行水合作用,从而使该催化剂具有独特的通用性。