A regiodivergent nickel-catalyzed hydrocyanation of 1-aryl-4-silyl-1,3-diynes is reported. When appropriate bisphosphine and phosphine–phosphite ligands are applied, the same starting materials can be converted into two different enynyl nitriles with good yields and high regioselectivities. The DFT calculations unveiled that the structural features of different ligands bring divergent alkyne insertion
Copper-Catalyzed Functionalized Tertiary-Alkylative Sonogashira Type Couplings via Copper Acetylide at Room Temperature
作者:Yu Yamane、Naoki Miwa、Takashi Nishikata
DOI:10.1021/acscatal.7b02615
日期:2017.10.6
several reports on Sonogashira couplings, but most of the reported reactions have employed aryl or alkenyl halides as coupling partners. Therefore, Sonogashira coupling is unsuitable for alkyl loadings, especially tertiary alkyl groups. In this research, we found that a copper catalyst is effective for a reaction between a terminal alkyne and an α-bromocarbonyl compound to form a quaternary carbon having
In this paper, we established copper catalyzed reductive borylation of terminal alkynes and diboron on water in the presence of amine. Moderate conditions enabled selective borylations of vinyl-substituted phenylacetylenes to undergo the borylation at a C-C triple bond. The Cu catalyst can be recycled for seven times. (C) 2017 Elsevier Ltd. All rights reserved.