Catalytic hydroboration of aldehydes, ketones, alkynes and alkenes initiated by NaOH
作者:Yile Wu、Changkai Shan、Jianxi Ying、Jue Su、Jun Zhu、Liu Leo Liu、Yufen Zhao
DOI:10.1039/c7gc01632h
日期:——
Commercially available NaOH powder is shown to be an efficient transition-metal-free initiator for the catalytic hydroboration of aldehydes, ketones, alkynes and alkenes with HBpin and 9-BBN under mild conditions. Combined experimental and theoretical studies suggest that the catalytically active species is a boron hydride generated in situ from the reaction mixture.
Transition-metal-free hydroboration of terminal alkynes activated by base
作者:Shibin Hong、Wei Zhang、Mengyan Liu、Zi-Jian Yao、Wei Deng
DOI:10.1016/j.tetlet.2015.09.077
日期:2016.1
Transition-metal and ligand-free method for the hydroboration of terminalalkynes with B2pin2 was reported in LiOt-Bu/toluene/MeOH system under room temperature. Alkylalkynes and arylalkynes reacted efficiently with high regioselectivity.
Highly Selective Methods for Synthesis of Internal (α-) Vinylboronates through Efficient NHC–Cu-Catalyzed Hydroboration of Terminal Alkynes. Utility in Chemical Synthesis and Mechanistic Basis for Selectivity
作者:Hwanjong Jang、Adil R. Zhugralin、Yunmi Lee、Amir H. Hoveyda
DOI:10.1021/ja2007643
日期:2011.5.25
procedures (1 mol % catalyst loading). Mechanistic studies are presented, indicating that α selectivity arises from the structural and electronic attributes of the NHC ligands and the alkyne substrates. Consistent with suggested hypotheses, catalyticreactions with a Cu complex, derived from an N-adamantyl-substituted imidazolinium salt, afford high β selectivity with the same class of substrates and under
Cobalt‐Catalyzed Markovnikov‐Type Selective Hydroboration of Terminal Alkynes
作者:Jieping Chen、Xuzhong Shen、Zhan Lu
DOI:10.1002/anie.202012164
日期:2021.1.11
Markovnikov‐type hydroboration of terminal alkynes with HBpin to access α‐alkenyl boronates with good regioselectivity and atom economy is reported. A new ligand has been developed for the cobalt hydride catalyst that has been used for a unique Markovnikov selective insertion of terminal alkynes into metal hydride bond. This operationally simple protocol exhibits excellent functional group tolerance