Stereoselective synthesis of trifluoromethyl-substituted 1,2-diamines by aza-Michael reaction with trans-3,3,3-trifluoro-1-nitropropene
作者:Joël Turconi、Luc Lebeau、Jean-Marc Paris、Charles Mioskowski
DOI:10.1016/j.tet.2006.06.013
日期:2006.8
Aza-Michael addition of optically pure 4-phenyl-2-oxazolidinone to 3,3,3-trifluoro-1-nitropropene proceeds smoothly at low temperature with a high yield. Diastereoselectivity of the addition depends on the base used and lithiated species proved to be highly efficient affording 92% de. Optically pure 1,2-diamino-3,3,3-trifluoropropane is prepared in 58% yield from the aza-Michael addition product through
光学纯的4-苯基-2-恶唑烷酮在3,3,3-三氟-1-硝基丙烯中的Aza-Michael加成反应在低温下可顺利进行,且收率很高。添加的非对映选择性取决于所用的碱,并且锂化的物种被证明是高效的,提供92%的de。通过三步法,由氮杂-迈克尔加成产物以58%的产率制备光学纯的1,2-二氨基-3,3,3-三氟丙烷。