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Nickel-catalyzed difunctionalization of allyl moieties using organoboronic acids and halides with divergent regioselectivities†
Chemical Science ( IF 7.6 ) Pub Date : 2017-10-26 00:00:00 , DOI: 10.1039/c7sc03149a
Wanfang Li 1 , Jie Kang Boon 1 , Yu Zhao 1
Affiliation  

Efficient difunctionalization of alkenes allows the rapid construction of molecular complexity from simple building blocks in organic synthesis. We present herein a nickel-catalyzed dicarbofunctionalization of alkenes using readily available organoboronic acids and organic halides in a three-component fashion. In particular, an unprecedented regioselectivity of the 1,3-dicarbofunctionalization of N-allylpyrimidin-2-amine is achieved when aryl and methyl iodides are utilized. In contrast, the use of alkyl bromides with β-hydrogens results in 1,3-hydroarylation or oxidative 1,3-diarylation. Preliminary mechanistic studies suggest an isomerization involving nickel hydride in the 1,3-difunctionalization reactions. On the other hand, the use of alkenyl or alkynyl halides promotes alternative regioselectivities to deliver 1,2-alkenylcarbonation or intriguing 2,1-alkynylcarbonation products. Such 2,1-alkynylarylation is also applicable to N-allylbenzamide as a different class of substrates. Overall, this nickel-catalyzed process proves to be powerful in delivering versatile difunctionalized compounds using readily available reagents/catalysts and a simple procedure.

中文翻译:

使用具有不同区域选择性的有机硼酸和卤化物对烯丙基部分进行镍催化双官能化†

烯烃的有效双官能化允许从有机合成中的简单构件快速构建分子复杂性。我们在此提出了一种镍催化的烯烃的二碳官能化,使用容易获得的有机硼酸和有机卤化物以三组分方式进行。特别是, N的 1,3-二碳官能化具有前所未有的区域选择性当使用芳基碘和甲基碘时,可获得-烯丙基嘧啶-2-胺。相反,使用具有 β-氢的烷基溴会导致 1,3-氢化芳基化或氧化 1,3-二芳基化。初步机理研究表明,在 1,3-双官能化反应中发生了涉及氢化镍的异构化反应。另一方面,烯基或炔基卤化物的使用促进了替代区域选择性以提供 1,2-烯基碳化或有趣的 2,1-炔基碳化产物。这种2,1-炔基芳基化也适用于N-烯丙基苯甲酰胺作为不同种类的底物。总体而言,这种镍催化工艺被证明在使用现成的试剂/催化剂和简单的程序提供多功能双官能化化合物方面非常强大。
更新日期:2017-10-26
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