Electrostatic Control of Regioselectivity in Au(I)-Catalyzed Hydroarylation
作者:Vivian M. Lau、William C. Pfalzgraff、Thomas E. Markland、Matthew W. Kanan
DOI:10.1021/jacs.6b11971
日期:2017.3.22
states. Here we investigate the effects of ion pairing on the regioselectivity of the hydroarylation of 3-substituted phenyl propargyl ethers catalyzed by cationic Au(I) complexes, which forms a mixture of 5- and 7-substituted 2H-chromenes. We show that changing the solvent dielectric to enforce ion pairing to a SbF6- counterion changes the regioselectivity by up to a factor of 12 depending on the substrate
Use of dimethyldioxirane in the preparation of highly reactive compounds: First direct epoxidation of precocenes
作者:Jordi Bujons、Francisco Camps、Angel Messeguer
DOI:10.1016/s0040-4039(00)97852-3
日期:1990.1
Natural precocenes and related analogues react with dimethyldioxirane to give the corresponding 3,4-epoxy derivatives in very high yields. This procedure constitutes the first directpreparation of these highly reactive compounds.