cobalt-bisoxazoline catalyst and afforded various α-alkyl-β,γ-unsaturated esters with excellent enantioselectivities and moderate to good yields (≤95% ee and ≤82% yields). The formal synthesis of the Californiaredscalepheromone using this method was investigated, and radical clock experiments were performed.
本发明公开了一种不对称催化合成手性烯酸酯的新方法。该方法利用双噁唑啉手性配体与钴催化的外消旋的2‑卤代羧酸酯与烯基格氏试剂的不对称Kumada交叉偶联反应,直接在酯的α位引入烯基,合成手性烯酸酯。具有反应条件温和、对环境友好、反应产率较好(up to80%yield),产物光学纯度高(up to 93%ee)等优点。
Piva, Olivier; Mortezaei, Reza; Henin, Françoise, Journal of the American Chemical Society, 1990, vol. 112, # 25, p. 9263 - 9272