Enantioselective Synthesis of Hydroxy-Substituted DBN-Type Amidines as Potential Chiral Catalysts
作者:Martin Ostendorf、Sandor van der Neut、Floris P. J. T. Rutjes、Henk Hiemstra
DOI:10.1002/(sici)1099-0690(200001)2000:1<105::aid-ejoc105>3.0.co;2-n
日期:2000.1
The synthesis and X-ray crystal structures of three enantiopure hydroxy-substituted amidines of the DBN-type are described. The key starting material, a 5-(phenylsulfonyl)pyrrolidin-2-one, was obtained by an oxazaborolidine-catalysed reductive desymmetrization of a meso-imide and was functionalized through N-acyliminium ion chemistry. The hydroxy groups were introduced by ozonolysis or reduction. Preliminary
描述了 DBN 型的三个对映纯羟基取代脒的合成和 X 射线晶体结构。关键起始材料 5-(苯基磺酰基)pyrrolidin-2-one 是通过 oxazaborolidine 催化的内消旋酰亚胺还原去对称化获得的,并通过 N-acyliminium 离子化学进行功能化。通过臭氧分解或还原引入羟基。描述了在选定的迈克尔反应中使用羟基脒作为手性双功能催化剂的初步结果。