Efficient Synthesis of Dihydrobenzofurans
via a Multicomponent Coupling of Salicylaldehydes, Amines, and Alkynes
作者:Chao-Jun Li、Rene-Viet Nguyen
DOI:10.1055/s-2008-1078573
日期:——
A simple and efficient synthesis of dihydrobenzofurans was developed using a multicomponent coupling of various salicylaldehydes, amines, and alkynes. The use of aliphatic alkynes containing a heteroatom is critical to the success of the reaction.
Gold Catalysis: Deuterated Substrates as the Key for an Experimental Insight into the Mechanism and Selectivity of the Phenol Synthesis
作者:A. Stephen K. Hashmi、Matthias Rudolph、Hans-Ullrich Siehl、Masato Tanaka、Jan W. Bats、Wolfgang Frey
DOI:10.1002/chem.200701795
日期:2008.4.18
influence of neighboring substituents. This is supported by quantum chemical calculations of the intermediates. The lack of exchange of deuterium labels excludes even equilibria with acetylide or vinylidene intermediates and the observed deuterium distribution in the final products is in accord with the NIH-shift reaction. In addition, these findings now explain previously obtained results.