Synthesis of (Z)-3-aryloxy-acrylonitriles, (E)-3-aryloxy-acrylonitriles and 3-cyanobenzofurans through the sequential reactions of phenols with propiolonitriles
作者:Wei Zhou、Yicheng Zhang、Pinhua Li、Lei Wang
DOI:10.1039/c2ob25969a
日期:——
A Na2CO3-promoted addition of phenols to propiolonitriles generated (Z)-3-aryloxy-acrylonitriles in nearly quantitative yields with exclusively Z-isomers, and a DABCO-promoted addition reaction of phenols with propiolonitriles afforded mainly (E)-3-aryloxy-acrylonitriles with high yields. The obtained (E)-3-aryloxy-acrylonitriles underwent intramolecular cyclization to give 3-cyanobenzofurans in good yields through palladium-catalyzed direct C–H bond functionalization.
A highly efficient and enantioselective hydrogenation of β-aryloxy/alkoxy cinnamic nitriles and esters under mild conditions has been realized by using a rhodium catalyst with a chiral f-spiroPhos ligand. The method provides efficient access to the asymmetricsynthesis of a variety of chiral β-oxy-functionalized nitriles and esters with excellent enantioselectivities (up to 99.9% ee) and high turnover
Copper-catalyzed direct cyanation of terminal alkynes with benzoyl cyanide
作者:Yan Du、Zheng Li
DOI:10.1016/j.tetlet.2018.11.049
日期:2018.12
Copper-catalyzed direct cyanation of terminal alkynes is achieved using less toxic, stable and easy to handle benzoylcyanide as a cyanide source and air as an oxidant. This protocol provides a good alternative to the preparation of 3-arylpropiolonitriles under mild condition.