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
在有机催化剂存在下,邻羟基肉桂醛与有机硼酸的区域选择性1,2-加成和1,4-加成反应分别得到2-取代的2 H-色烯和4-取代的苯并吡喃-2-醇。二乙胺用作1,4-加成反应的催化剂,而二苄胺和三氯乙酸分别用作1,2-加成反应的催化剂和添加剂。 催化-加成反应-杂环-区域选择性-铬醇-色烯