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以氯化锌为路易斯酸催化剂,探讨了2─亚甲基─1─苯基─1.3─丁二酮与1.3─环戊二烯的Diels─Alder反应。在-78℃时,氯化锌作为催化剂,得到高的非对映异构选择性(exo:endo=94:6)。
Diels-Alder reaction of 2-methylene-1-phenyl-1,3-butanedione and 1,3-cyclopentadiene with zinc chloride as Lewis acid catalyst was discussed. At -78 ° C zinc chloride was used as a catalyst to give a high diastereoselectivity (exo: endo = 94: 6).