Catalytic Performance of Polystyrene-Bound<i>ChibaG</i>Derivatives as Guanidine Organobases in Asymmetric<i>Michael</i>Additions
作者:Tsutomu Ishikawa、Takashi Heima、Makoto Yoshida、Takuya Kumamoto
DOI:10.1002/hlca.201300259
日期:2014.3
The guanidine organocatalyst, ChibaG, was bound via an ether linkage to the phenyl group of the 2‐imino substituent to Merrifield resin. Polystyrene‐bound ChibaG acted as an effective catalyst in the Michael reaction of tert‐butyl N‐(diphenylmethylidene)glycinate with methyl vinyl ketone, and could be recovered and reused many times.
胍有机催化剂,ChibaG,必然会经由醚键与苯基的2-亚氨基取代基的梅里菲尔德树脂。聚苯乙烯键合的ChibaG在N-(二苯基亚甲基)甘氨酸叔丁基酯与甲基乙烯基酮的Michael反应中起有效的催化剂作用,可以被回收并重复使用多次。