Highly Efficient C−C Bond-Forming Reactions in Aqueous Media Catalyzed by Monomeric Vanadate Species in an Apatite Framework
作者:Takayoshi Hara、Satoko Kanai、Kohsuke Mori、Tomoo Mizugaki、Kohki Ebitani、Koichiro Jitsukawa、Kiyotomi Kaneda
DOI:10.1021/jo0614745
日期:2006.9.1
reactions such as Michael and aldol reactions in aqueous media and the H−D exchange reactions using deuterium oxide. For example, a 200-mmol-scale Michael reaction under triphasic conditions proceeded rapidly, with an extremely high turnover number of up to 260 400 and an excellent turnover frequency of 48 s-1. No vanadium leaching was detected during the above reactions, and the catalyst was readily recycled
甲钒酸钙磷灰石(VAP),其中PO 4 3 -羟基磷灰石(HAP),钙10(PO 4)6(OH)2,完全被取代的VO 4 3 -在磷灰石框架,被合成。VAp的理化分析表明存在分离出的VO 4具有五价氧化态的四面体单元。VAp可作为高性能异质碱催化剂,用于各种碳-碳键形成反应,例如水性介质中的迈克尔和醛醇反应以及使用氘化氢的H-D交换反应。例如,三相条件下的200毫摩尔规模迈克尔反应快速进行,具有高达260 400的非常高的转换数和第48号第一个极好的转换频率- 1。在上述反应过程中未检测到钒的浸出,并且催化剂易于循环使用而没有活性损失。