此处报道的是室温下无金属的碘代芳烃催化的未活化烯烃的氧化。在此过程中,烯烃通过酰胺基团的氧原子和外源HNT 2分子中的氮进行双官能化。这种温和的露天反应提供了对N-双甲苯磺酰基取代的5-亚氨基-2-四氢呋喃基甲胺衍生物的有效合成,这是药物开发和生物学研究的重要主题。基于实验和密度泛函理论计算的机理研究表明,这种转变是通过原位活化底物烯烃而进行的生成的阳离子碘鎓(III)中间体,随后被酰胺的氧原子(而不是氮)攻击形成五元环中间体。最后,该中间体通过作为亲核试剂的NTs 2经历S N 2反应,得到氧和氮双官能化的5-亚氨基-2-四氢呋喃基甲胺产品。使用手性碘代芳烃作为催化剂的本发明烯烃氧化胺的不对称变体对于某些底物也给出了有希望的结果。
Deoxygenative α-alkylation and α-arylation of 1,2-dicarbonyls
作者:Shengfei Jin、Hang T. Dang、Graham C. Haug、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1039/d0sc03118f
日期:——
challenging but synthetically indispensable approach to α-branched carbonyl motifs that are widely represented among drugs, natural products, and synthetic intermediates. Here, we describe a simple approach to generation of boron enolates in the absence of strong bases that allows for introduction of both α-alkyl and α-aryl groups in a reaction of readily accessible 1,2-dicarbonyls and organoboranes. Obviation
Aminolactonization of Unactivated Alkenes Catalyzed by Aryl Iodine
作者:Lu-Wen Zhang、Xiao-Jun Deng、Dong-Xu Zhang、Qin-Qin Tian、Wei He
DOI:10.1021/acs.joc.1c00074
日期:2021.4.2
protocol of the aryl iodine-catalyzed aminolactonization of unactivated alkenes under oxidation conditions was first reported to efficiently construct diverse amino lactones in a short time using HNTs2 as the compatible nitrogen source. In addition, we investigated the influence of the reaction rate based on the structure of the iodoarene precatalyst, which revealed the selective adjustment effect on aminolactonization