Palladium-Catalyzed Enantioselective Ene and Aldol Reactions with Isatins, Keto Esters, and Diketones: Reliable Approach to Chiral Tertiary Alcohols
作者:Kohsuke Aikawa、Shunsuke Mimura、Yukinobu Numata、Koichi Mikami
DOI:10.1002/ejoc.201001356
日期:2011.1
Chiral dicationic Pd-complex-catalyzed enantioselective ene and aldol reactions with various isatin derivatives are shown to produce the corresponding 3-hydroxy-2-oxindole products in good yields with high enantioselectivities. These catalytic processes are effective not only with isatins but also with keto esters and diketones derivatives. Even with unprotected isatin, high yields and enantioselectivities
手性双阳离子 Pd 配合物催化的对映选择性烯和醛醇与各种靛红衍生物的反应显示出相应的 3-羟基-2-羟吲哚产物,产率高,对映选择性高。这些催化过程不仅对靛红有效,而且对酮酯和二酮衍生物也有效。即使使用未保护的靛红,也能获得高产率和对映选择性,以生产天然存在的化合物 convolutamydine A。随后,可以实现烯产物的 m-CPBA 的 α-氧化和 selectfluor 的 α-氟化,分别得到相应的 α-羟基和 α-氟酮。