A general and atom‐economical synthesis of 1,1‐diborylalkanes fromalkenes and a borane without the need for an additional H2 acceptor is reported for the first time. The key to our success is the use of an earth‐abundant zirconium‐based catalyst, which allows a balance of self‐contradictory reactivities (dehydrogenative boration and hydroboration) to be achieved. Our method avoids using an excess
Synthesis of 1,1-Organodiboronates
via Rh(I)Cl-Catalyzed Sequential Regioselective Hydroboration
of 1-Alkynes
作者:Kohei Endo、Takanori Shibata、Munenao Hirokami
DOI:10.1055/s-0028-1088131
日期:——
A Rh(I)Cl-DPPB-complex-catalyzed sequential hydroboration of aryl alkynes and aliphatic alkynes was achieved. The reaction proceeded with almost perfect regioselectivity to afford 1,1-organodiboronate compounds in moderate to good yield.
Copper-Catalyzed Regio- and Diastereoselective Additions of Boron-Stabilized Carbanions to Heteroarenium Salts: Synthesis of Azaheterocycles Containing Contiguous Stereocenters
作者:Rajender Nallagonda、Rashad R. Karimov
DOI:10.1021/acscatal.0c04474
日期:2021.1.1
Nucleophilic addition of diborylalkyl reagents to N-alkyl or N-acylpyridinium and related heteroarenium salts has been developed as a key step for the synthesis of nonaromatic nitrogen heterocycles that contain contiguous stereogenic centers. Derivatization of the dihydropyridine products for the synthesis of tetrahydropyridines and piperidines have also been described.
Selective Formal Carbene Insertion into Carbon‐Boron Bonds of Diboronates by
<i>N</i>
‐Trisylhydrazones
作者:Zhicheng Bao、Meirong Huang、Yan Xu、Xinhao Zhang、Yun‐Dong Wu、Jianbo Wang
DOI:10.1002/anie.202216356
日期:2023.2.20
Intermolecular reaction of N-trisylhydrazones with bis (boryl) methane led to the transformation of 1,1-diboronate into 1,2-bis(boronates) via 1,2-borylmethyl migration. With unsymmetric diboronates with two different boryl moieties, the reaction proceeded with excellent regioselectivity. DFT studies reveal an unusual neighbouring boryl group effect that accounts for the observed regioselectivity.