Scheme 1.
Synthesis of Homochiral Complex 4a
a (a) 1. (S)–AgO2CCH(Ph)(OMe) (2, 2 equiv), THF, 23 °C, 1.5 h, 97%; 2. chromatographic separation, 45%; (b) 1. pTsOH•H2O, THF, 5 min; 2. NaNO3, THF/MeOH, 15 min, 43%.
Synthesis of Homochiral Complex 4a
a (a) 1. (S)–AgO2CCH(Ph)(OMe) (2, 2 equiv), THF, 23 °C, 1.5 h, 97%; 2. chromatographic separation, 45%; (b) 1. pTsOH•H2O, THF, 5 min; 2. NaNO3, THF/MeOH, 15 min, 43%.