The addition of boronic acids to 2-allylidenemalonates under RhI or Pd²+ catalysis shows an enhanced selectivity for the 1,6-addition reaction in comparison with diunsaturated monoesters. In the case of the RhI-catalyzed addition, the position of the new C=C double bond in the final product can be tuned with the choice of the base to give vinylmalonates of alkylidenemalonates.
在RhI或Pd²+催化下,
硼酸的加入到2-烯丙基二烯
丙酸酯中,与二不饱和单酯相比,表现出对1,6-加成反应的增强选择性。在RhI催化的加成反应中,最终产物中新的C=C双键的位置可以通过选择不同的碱进行调节,从而生成烯基二烯
丙酸酯的烷基二烯
丙酸酯。