Chiral Brønsted Acid-Catalyzed Direct Mannich Reactions via Electrophilic Activation
作者:Daisuke Uraguchi、Masahiro Terada
DOI:10.1021/ja0491533
日期:2004.5.1
It was found that the phosphoric acid derivatives of general structure 1 serve as highly effective catalysts for the direct addition of acetyl acetone to N-Boc-protected arylimines. The beneficial effects of the 3,3'-bisaryl substituents of the catalysts on the enantioselectivity are greatly appreciated, and thus 1d functions as an excellent catalyst. The Brønsted acid-catalyzed direct Mannich reactions