作者:O. Hoarau、H. Aït-Haddou、M. Castro、G.G.A. Balavoine
DOI:10.1016/s0957-4166(97)00499-0
日期:1997.11
Several homochiral bis(oxazolines), with asymmetric centers on the oxazoline rings and on the side chains, were prepared from (1S,2S)-(+)-2-amino-1-phenyl-1,3-propanediol in high yields. Asymmetric cyclopropanation of styrene with ethyl diazoacetate in the presence of 1 mol% of copper(I) triflate and the dibenzoyl bis(oxazoline) 5a. gave ethyl 2-phenylcyclopropanecarboxylate in up to 85% ee. The same
从(1S,2S)-(+)-2-氨基-1-苯基-1,3-丙二醇高收率制备了几种在恶唑啉环和侧链上具有不对称中心的双手性双(恶唑啉)。在1摩尔%的三氟甲磺酸铜(I)和二苯甲酰基双(恶唑啉)5a存在下,苯乙烯与重氮乙酸乙酯进行不对称环丙烷化反应。产生高达85%ee的2-苯基环丙烷甲酸乙酯。在钯催化的1,3-二苯基-2-丙烯基乙酸乙酸酯的钯催化的对映选择性烯丙基取代中使用相同的配体5a,以得到高达90%ee的所需产物。