作者:Yoshifumi Hachisu、Jeffrey W. Bode、Keisuke Suzuki
DOI:10.1002/adsc.200404092
日期:2004.8
The scope and limitations of intramolecular benzoin-forming reactions of aldehydes and ketones catalyzed by the combination of a thiazoliumsalt and a base are described. After optimization of the reaction conditions, five- and six-membered cyclic acyloins were obtained in good to excellent yields and competing reactions such as intramolecular aldol reactions were suppressed. The analogous closure
Photolysis of 1,2-benzo-1,3-cycloalkadien-4-yl bromides and 1,2-benzo-,1,3-cycloalkadien-3-yl chlorides showed a remarkable effect of ring size on the rearrangements of the resulting 1,2-benzo-1,3-cycloalkadienyl cations, i.e., 1,2-aryl or alkyl migration across the double bond and 1,2-hydride or methyl migration to the cationic center.