Enantioselective Allylation of Aldehydes Catalyzed by Diastereoisomeric Bis(tetrahydroisoquinoline) N,N′-Dioxides
作者:Klára Vlašaná、Radim Hrdina、Irena Valterová、Martin Kotora
DOI:10.1002/ejoc.201001219
日期:2010.12
enantioselectivity up to 96 %. On the other hand, the allylation of aromatic aldehydes in the presence of the (R,R ax ,R) catalyst proceeded only in MeCN (up to 67 % ee), and the level of asymmetric induction was strongly influenced by the presence of electron-donating and -accepting groups in the aldehyde. The allylation of α,β-unsaturated aldehydes proceeded only in dichloromethane (enantioselectivity
在两种非对映异构体 (R,R ax ,R)- 和 (R,S ax ,R)-bis-1,1'-[5,6,7,研究了 8-四氢-3-(四氢呋喃-2-基)异喹啉]N,N'-二氧化物。反应过程受所选溶剂的影响很大。(R,S ax ,R) 催化剂有效地促进了 THF 中的反应,对映选择性高达 96%。另一方面,在 (R,R ax ,R) 催化剂存在下芳香醛的烯丙基化仅在 MeCN(高达 67 % ee)中进行,并且不对称诱导的水平受到电子存在的强烈影响。醛中的供体和受体基团。α,β-不饱和醛的烯丙基化仅在二氯甲烷中进行(对映选择性高达 68%)。