Borane-Catalyzed Selective Hydrosilylation of Internal Ynamides Leading to β-Silyl (<i>Z</i>)-Enamides
作者:Youngchan Kim、Ramesh B. Dateer、Sukbok Chang
DOI:10.1021/acs.orglett.6b03485
日期:2017.1.6
We have developed a borane-catalyzed regio- and stereoselectivehydrosilylation of internal ynamides for the first time. The scope of ynamide substrates and silane reactants was broad undermild reaction conditions, affording synthetically versatile β-silyl (Z)-enamide products. The observed stereoselectivity was reasoned to be due to the β-silicon effect on a postulated ketene iminium intermediate
Copper-catalyzed coupling of 1,2-dibromo-1-styrenes with sulfonamides for the preparation of ynamides
作者:Yuan Yang、Xiaoyun Zhang、Yun Liang
DOI:10.1016/j.tetlet.2012.09.092
日期:2012.11
Ynamides were prepared through an efficient copper-catalyzed coupling reaction. In the presence of copper iodide, 1,10-phenanthroline, and Cs2CO3, the coupling reaction of 1,2-dibromo-1-styrenes with sulfonamides proceeded smoothly and generated the corresponding products with excellent isolated yields. (C) 2012 Elsevier Ltd. All rights reserved.