Asymmetric synthesis of conformationally constrained 4-hydroxyprolines and their applications to the formal synthesis of (+)-epibatidine
作者:Alberto Avenoza、Carlos Cativiela、Miguel A. Fernández-Recio、Jesús M. Peregrina
DOI:10.1016/s0957-4166(99)00408-5
日期:1999.10
and (1S,3R,4R)-3-hydroxy-7-azabicyclo[2.2.1]heptane-1-carboxylic acids, two new conformationally constrained 4-hydroxyprolines, using a straightforward synthetic route and starting from (−)-8-phenylmenthyl 2-acetamidoacrylate. The easy transformation of the pure (1S,3S,4R)-3-hydroxy-7-azabicyclo[2.2.1]heptane-1-carboxylic acid into (1R,4S)-N-Boc-7-azabicyclo[2.2.1]heptan-2-one constitutes a new formal
该报告描述了对映体纯的(1 S,3 S,4 R)-和(1 S,3 R,4 R)-3-羟基-7-氮杂双环[2.2.1]庚烷-1-羧酸的合成,两种新的构象受限的4-羟基脯氨酸,使用简单的合成路线并从(-)-8-苯基薄荷基2-乙酰氨基丙烯酸酯开始。纯净的(1 S,3 S,4 R)-3-羟基-7-氮杂双环[2.2.1]庚烷-1-羧酸易于转化为(1 R,4 S)-N -Boc-7-氮杂双环[2.2.1]庚烷-2-酮构成(+)-表哌丁啶的新形式合成。