Regioselective Control of 1,2- Versus 1,4-Addition in Organocatalytic Reactions of o-Hydroxycinnamaldehydes with Organoboronic Acids
作者:Sung-Gon Kim、Kwang-Su Choi
DOI:10.1055/s-0030-1258268
日期:2010.12
The regioselective 1,2-addition and 1,4-addition reactions of o-hydroxycinnamaldehydes with organoboronic acids in the presence of organocatalysts gave 2-substituted 2H-chromenes and 4-substituted chroman-2-ols, respectively. Diethylamine was used as the catalyst for the 1,4-addition reaction, whereas dibenzylamine and trichloroacetic acid were used as the catalyst and additive, respectively, in the
Enantioselective Michael Addition Reaction of o-Hydroxycinnamaldehydes with Organoboronic Acids using Hydroxy Group-Containing Organocatalysts
作者:Yong-Cheon Lee、Sung-Gon Kim
DOI:10.5012/bkcs.2011.32.1.311
日期:2011.1.20
Asymmetric organocatalytic reactions of o-hydroxycinnamaldehydes with organoboronic acids: a facile enantioselective access to chromanes and dihydrobenzopyranes
作者:Kwang-Su Choi、Sung-Gon Kim
DOI:10.1016/j.tetlet.2010.07.138
日期:2010.9
4-addition reactions of organoboronic acids to o-hydroxycinnamaldehydes, which afford chromanes and dihydrobenzopyranes, have been established using an organocatalyst derived from imidazolidinone. The chromanes have been obtained in high chemical yields and enantioselectivities and can be readily used to obtain a variety of chromane derivatives through subsequent transformations.