Prepn of DL-form: Pfister, FR M1553 (1962 to Merck & Co.), C.A. 59, 12921e (1963); Sletzinger et al., J. Med. Chem. 6, 101 (1963); GB 940596; Chemerda et al., US 3462536 (1963, 1969 both to Merck & Co.). Synthesis of the L-form: Karady et al., DE 2062285; DE 2062332 (both 1971 to Merck & Co.), C.A. 75, 118122t, 118120r (1971); eidem, J. Org. Chem. 36, 1946, 1949 (1971).
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