All aspects of the title reaction, essentially the only entry into optically active 3-monosubstituted-1-bromoallenes up to now, have been probed systematically for the first time. The new results show that: (1) there is no need to purify CuBr or to exclude air or moisture, (2) addition of Cu(II) led to even higher enantiopurity, and (3) Et2O is the best solvent. Much better selectivities were obtained under the new conditions.
标题反应的所有方面,基本上是迄今为止唯一进入光学活性3-单取代-1-
溴烯的反应,首次被系统地研究。新的结果表明:(1)没有必要纯化CuBr或排除空气或
水分;(2)添加Cu(II)会导致更高的对映体纯度;(3)Et2O是最好的溶剂。在新的条件下,选择性得到了很大的提高。