Gold(I)-Catalyzed Diastereoselective Hydroacylation of Terminal Alkynes with Glyoxals
作者:Shuai Shi、Tao Wang、Vanessa Weingand、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201307685
日期:2014.1.20
The reaction of an α‐ketoaldehyde and a terminal alkyne in the presence of piperidine and a catalytic amount of AuCl delivers 1,2‐dicarbonyl‐3‐enes, products of the formal hydroacylation of the triple bond. The scope of the method is broad; different aryl substituents on the dicarbonyl unit and on the alkyne are well tolerated. The products can be transformed selectively into vinylquinoxalines. Mechanistic
在哌啶和催化量的AuCl存在下,α-酮醛与末端炔的反应可生成1,2-二羰基-3-烯,这是三键形式正式加氢酰化的产物。该方法的范围很广。在二羰基单元和炔烃上的不同芳基取代基具有良好的耐受性。产物可以选择性地转化为乙烯基喹喔啉。包括同位素标记实验在内的机理研究表明,在最初的A 3型转化为炔丙基胺之后,随后的碱介导的炔烃至丙二烯异构化反应以及后处理过程中烯胺亚结构的水解将提供正式的加氢酰化产物。