Selective Synthesis of Nonracemic 3-Pyrrolines and 2,3-cis-2-Vinylaziridines from (Z)-Amino Allylic Alcohols: A New Synthetic Route to Chiral 3,4-Dehydroproline - Ishii, Kiyonori; Ohno, Hiroaki; Takemoto, Yoshiji; Ibuka, Toshiro (Synlett, 1999)