Preparation of Optically Pure α-Trifluoromethyl-α-amino Acids from<i>N</i>-Tosyl-2-trifluoromethyl-2-alkyloxycarbonyl Aziridine
作者:Toshimasa Katagiri、Yousuke Katayama、Mayuko Taeda、Takanori Ohshima、Naomi Iguchi、Kenji Uneyama
DOI:10.1021/jo201554g
日期:2011.11.18
The preparation of optically pure α-trifluoromethyl-α-amino acids from N-tosyl-2-trifluoromethyl-2-alkyloxycarbonylaziridine is described. Optically pure aziridine was prepared with a 60% yield via three steps from optically pure 2,3-epoxy-1,1,1-trifluoropropane (TFPO). Ring-opening reactions of the aziridine with a variety of nucleophiles and subsequent deprotection of the N-tosyl moieties gave the
描述了由N-甲苯磺酰基-2-三氟甲基-2-烷氧基羰基氮丙啶制备光学纯的α-三氟甲基-α-氨基酸。通过三个步骤,由光学纯的2,3-环氧-1,1,1-三氟丙烷(TFPO)制备光学纯的氮丙啶,产率为60%。氮丙啶与各种亲核试剂的开环反应以及随后的N-甲苯磺酰基部分脱保护得到了光学纯的β-取代的-α-三氟甲基-α-氨基酸,具有中等至良好的收率(高达85%),而没有消旋作用在氨基酸的四级立体中心。