钯催化的 NHC 配体控制的 Regiodivergent 烯丙基-氟烯丙基交叉耦合反应

Yangyang Ma , Boxia Xu , Hua Zhang , Zhiping Li
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引用次数: 0

摘要

报告了钯催化 (E)-2- 氟烯丙基碳酸酯和烯丙基硼酸酯的交叉偶联。其区域选择性易受 NHC 配体立体要求的影响,小的 IMes 有利于线性氟化 1,5 二烯,而具有立体拥挤特征的 IPrBIDEA 则有利于支链产物。对照实验表明,2-氟烯丙基碳酸盐或 gem-F2CPs 都能以极好的区域选择性进行烯丙基化反应,但前者的支化反应活性较低。
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Palladium-catalyzed NHC ligand-controlled regiodivergent allyl-fluoroallyl cross-couplings†
The palladium-catalyzed cross-coupling of (E)-2-fluoroallyl carbonates and allylboronates is reported. The regioselectivity is susceptive to the steric requirements of the NHC ligand, with small IMes favoring linear fluorinated 1,5-dienes, while IPrBIDEA featuring sterically-congested character benefits branched products. Control experiments revealed that either 2-fluoroallyl carbonates or gem-F2CPs could undergo allylation with excellent regioselectivity, yet the former showed somewhat lower branched reactivity.
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