Synthesis of 3-methyl-2-cyclohexenones catalyzed by mercury(II) salts and their microwave assisted BiCl3 catalyzed aldol condensations
摘要:
HgSO4 catalyzed hydrative cyclization of 1,6-heptadiynes is present. This reaction proceeded smoothly under the mild condition for differently 4-sustituted 1,6-diynic substrates giving corresponding 3-methyl-2-cyclohexenones with high to excellent yield. The microwave assisted aldol condensation of cyclohexenones under the catalysis of BiCl3 afforded 3-styryl-cyclohexenones with high regio- and stereo-selectivity. (C) 2010 Elsevier B.V. All rights reserved.
Cobalt-Catalyzed Cyclization/Hydroboration of 1,6-Diynes with Pinacolborane
作者:Qiang Huang、Meng-Yang Hu、Shou-Fei Zhu
DOI:10.1021/acs.orglett.9b02873
日期:2019.10.4
Herein, we report a protocol for cyclization/hydroboration of 1,6-diynes with pinacolborane using a cobalt catalyst generated in situ from a Co(II)-phenanthroline complex, tetrabutylammonium fluoride, and pinacolborane. This protocol, which features good functional group tolerance, a broad substrate scope, and excellent stereoselectivity, enables the synthesis of useful cyclic 1,3-dienylboron compounds