Trimethylsilyl trifltate catalyzed aldol-type reaction of enol silyl ethers and acetals or related compounds
作者:Shizuaki Murata、Masaaki Suzuki、Ryoji Noyori
DOI:10.1016/s0040-4020(01)86671-0
日期:1988.1
condensation of enol trimethylsllyl ethers with acetals, orthoformate, or 2-acetoxytetrahydrofuran or -pyrans to give the corresponding β-alkoxy carbonylcompounds. Reaction of enolsilylethers and carboxonium triflate ion-pair intermediates occurs via acyclic transition states and exhibits moderate to high erythro selectivity independent of the geometry (E/Z) of the enolsilylethers.
A Highly Efficient Large-Scale Asymmetric Direct Intermolecular Aldol Reaction Employing L-Prolinamide as a Recoverable Catalyst
作者:Yang Yang、Yan-Hong He、Zhi Guan、Wei-Da Huang
DOI:10.1002/adsc.201000355
日期:2010.10.4
A new, simple bifunctional, recoverable and reusable L-prolinamide organocatalyst that promotes aldolreactions while achieving a respectable level of enantioselectivity is reported. This organocatalyst is applicable to the reactions of a wide range of aromatic and heteroaromatic aldehydes with cyclic and acyclic ketones, and the anti-aldol products could be obtained with up to 99:1 anti/syn ratio