C–O Functionalization of α-Oxyboronates: A Deoxygenative <i>gem</i>-Diborylation and <i>gem</i>-Silylborylation of Aldehydes and Ketones
作者:Lu Wang、Tao Zhang、Wei Sun、Zeyu He、Chungu Xia、Yu Lan、Chao Liu
DOI:10.1021/jacs.7b02518
日期:2017.4.12
the success of this transformation is the base-promoted C-O bond borylation or silylation of the generated α-oxyboronates. Experimental and theoretical studies exhibit that the C-O bond functionalization proceeds via an intramolecular five-membered transition-state (9-ts) boryl migration followed by a 1,2-metalate rearrangement with OBpin as a leavinggroup. The transformation occurs with an inversion
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 Synthesis of 1,1-Diborylalkanes through Regioselective Dihydroboration of Terminal Alkynes
作者:Sumin Lee、Dingxi Li、Jaesook Yun
DOI:10.1002/asia.201402458
日期:2014.9
The copper‐catalyzed sequential hydroboration of terminalalkynes with pinacolborane to prepare 1,1‐diborylalkanes directly from alkynes was studied. Protected propargyl amines, propargyl alcohol derivatives, and simple alkynesregioselectively produced the desired 1,1‐diborylalkanes in good yields with a copper/xantphos catalyst.
Generation of α‐Boryl Radicals and Their Conjugate Addition to Enones: Transition‐Metal‐Free Alkylation of
<i>gem</i>
‐Diborylalkanes
作者:Chaoqiang Wu、Zhicheng Bao、Bowen Dou、Jianbo Wang
DOI:10.1002/chem.202004581
日期:2021.2
A transition‐metal‐free method for the alkylation of gem‐diborylalkanes with α,β‐unsaturated ketones has been developed. It is demonstrated that the α‐boryl radicals can be generated efficiently from gem‐diborylalkanes with the aid of catechol and oxidants. The α‐boryl radicals formed through such process can be engaged in conjugate addition reaction with α,β‐unsaturated ketones. This transformation
Hetero diacylation of 1,1-diborylalkanes: Practical synthesis of 1,3-diketones
作者:Liang-Hua Zou、Min Fan、Lu Wang、Chao Liu
DOI:10.1016/j.cclet.2019.12.016
日期:2020.7
the synthesis of asymmetric 1,3-diketones was reported through diacylation of 1,1-diborylalkanes using two different acyl sources. In this transformation, an enolate boron species was initially formed by introducing an acyl group, then it was trapped by another acyl group to form 1,3-diketone. This method not only provided the gateway to obtain a series of 1,3-diketones, but also afforded an operationally