AgOTf-catalyzed one-pot reactions of 2-alkynylbenzaldoximes with various alpha,beta-unsaturated carbonyl compounds under mild conditions are described, which provides a facile and efficient pathway for the synthesis of 1-alkylated isoquinoline derivatives. The method tolerates a wide range of substrates and allows for the preparation of the products of interest in moderate to excellent yields.
Synthesis of 1,3-dibromo-2-aryl-1H-indenes via NBS mediated unusual bromination of 2-alkynylbenzaldoximes
作者:Raju Singha、Munmun Ghosh、Saikat Das、Dhiraj Das、Jayanta K. Ray
DOI:10.1039/c6nj01201a
日期:——
We have investigated a very interesting side-pathway leading to 1,3-dibromo-2-aryl-1H-indenes as opposed to isoquinoline N-oxides during the NBS mediated synthesis of isoquinoline N-oxide from 2-alkynylbenzaldoximes.
An efficient reaction of 2-alkynylbenzaldoximes with 2-isocyanoacetates cocatalyzed by silver triflate and gold(I) chloride is described, providing 1-aminoisoquinolines in good to excellent yields under mild conditions. Mechanistic experiments suggest that the gold(I) cation might play a crucial role in the activation of the isocyanide substrate. The observed reactivity and the unique pathway of substrate activation in the cocatalyzed processes are quite informative for further study.