One-pot three components synthesis of O-acetylcyanohydrins with TMSCN, acetic anhydride and carbonyl compounds under solvent-free condition
作者:Santosh T. Kadam、Sung Soo Kim
DOI:10.1016/j.tet.2009.06.020
日期:2009.8
One-pot three components synthesis of O-acetylcyanohydrins has been developed in the presence of B(C6F5)3 as the catalyst. Variety of aldehydes or ketones reacts with TMSCN and acetic anhydride (Ac2O) under the influence of 1 mol % of B(C6F5)3 to give good to excellent yield of the products without solvent at rt.
在存在B(C 6 F 5)3作为催化剂的情况下,已经开发了O-乙酰基氰醇的一锅三组分合成法。在1摩尔%的B(C 6 F 5)3的影响下,各种醛或酮与TMSCN和乙酸酐(Ac 2 O)反应,从而在室温下在不使用溶剂的情况下获得了良好的优异收率。
Asymmetric addition of KCN and Ac 2 O to aldehydes catalyzed by recyclable polymeric salen-Ti(IV) complexes
Polymeric salen-Ti(IV) complexes were employed in the enantioselective O-acetyl cyanation of aldehydes with KCN and Ac2O. The polymeric catalysts with appropriate crosslinking degree exhibited good activities and enantioselectivities, up to 94% yield and 91% ee were obtained at -20degreesC with 1 mol% of catalyst (based on bimetallic catalytic unit). Moreover, the crosslinked polymeric catalyst could be easily recovered and reused for six consecutive runs without obvious decrease in activity and enantioselectivity. (C) 2004 Elsevier Ltd. All rights reserved.