反应详情

In the same manner as in Example 36 except that (2S,4S)-ptbp-skewphos was used as an asymmetric ligand instead of (2S,4S)-skewphos, benzyl 3-(2-methoxy-1-(phenylamino)ethylidene)-2-oxopyrrolidine-1-carboxylate was hydrogenated. Quantification by high performance liquid chromatography confirmed that the starting material, benzyl 3-(2-methoxy-1-(phenylamino)ethylidene)-2-oxopyrrolidine-1-carboxylate, remained by 10%, the reaction intermediate, benzyl 3-(2-methoxy-1-(phenylamino)ethyl)-2-oxopyrrolidine-1-carboxylate, remained by 21%, and the resultant product, (3aR,4R,9bR)-benzyl 4-(methoxymethyl)-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinoline-1-carboxylate was produced by 67%. The optical purity of the resultant product was 65% ee. The results of Examples 36 to Example 39 are summarized in Table 1 below.