Enantioselective Synthesis of (R)-α-Alkylhomoserines and (R)-α-Alkylhomocysteines via Phase-Transfer Catalytic Alkylation - Kim, Taek-Soo; Lee, Yeon-Ju; Lee, Kyoungyim; Jeong, Byeong-Seon; Park, Hyeung-geun; Jew, Sang-sup (Synlett, 2009)