Regioselective Control of 1,2-Versus 1,4-Addition in Organocatalytic Reactions of o-Hydroxycinnamaldehydes with Organoboronic Acids

[摘要]：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 1,2-addition reaction.

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