Highly Efficient and Diastereoselective Gold(I)-Catalyzed Synthesis of Tertiary Amines from Secondary Amines and Alkynes: Substrate Scope and Mechanistic Insights
作者:Xin-Yuan Liu、Zhen Guo、Sijia S. Dong、Xiao-Hua Li、Chi-Ming Che
DOI:10.1002/chem.201101982
日期:2011.11.11
without the need of isolation of air/moisture‐sensitive enamine intermediates, and under mild reaction conditions (mostly room temperature and mild reducing agents). Mechanistic studies by NMR spectroscopy, ESI‐MS, isotope labeling studies, and DFT calculations on this gold(I)‐catalyzed tandem reaction reveal that the first step involving a monomeric cationic gold(I)–alkyne intermediate is more likely than
已经开发了一种通过金(I)催化的炔烃与仲胺的串联反应合成叔胺的有效方法。在乙基Hantzsch酯和[(t Bu)2(邻-联苯基)P} AuCl] / AgBF 4(2 mol%)的存在下,各种带有电子缺陷和电子富集取代基的仲胺和多种一系列炔烃(包括末端和内部芳基炔烃,脂肪族炔烃和缺电子炔烃)进行串联反应,以最高99%的收率得到相应的叔胺。对于带有预先存在的手性中心的二氢吲哚,它们在[[(t Bu)2催化的乙基汉茨sch酯存在下与炔烃的反应(邻联苯)P} AuCl] / AgBF 4(2mol%)以优异的产率提供了叔胺,并且具有良好的至优异的非对映选择性。所有这些有机转化都可以通过简单易用的原料作为单锅反应进行,而无需分离空气/水分敏感的烯胺中间体,并且可以在温和的反应条件下(通常是室温和温和的还原剂)进行。通过NMR光谱,ESI-MS,同位素标记研究以及对该金(I)催化串联反应进行DFT