Superparamagnetic copper ferrite nanoparticles catalyzed aerobic, ligand-Free, regioselective hydroboration of alkynes: Influence of synergistic effect
作者:Balaji Mohan、Kang Hyun Park
DOI:10.1016/j.apcata.2016.03.019
日期:2016.6
We discovered a general and comprehensive approach for the regioselective hydroboration of terminal and internalalkynes to synthesize vinylboronates using inexpensive and magnetically separable copper ferrite nanoparticles at low catalyst loading using Bis(pinacolato)diboron in the absence of ligand and additives, under mild and greener conditions. A diverse range of functional groups was tolerated
Copper(I)‐Catalyzed Regioselective Monoborylation of 1,3‐Enynes with an Internal Triple Bond: Selective Synthesis of 1,3‐Dienylboronates and 3‐Alkynylboronates
作者:Yusuke Sasaki、Yuko Horita、Chongmin Zhong、Masaya Sawamura、Hajime Ito
DOI:10.1002/anie.201007182
日期:2011.3.14
Hooray for hydroboration! The products afforded by the title reaction depend on the substitution pattern on the double bond moiety of 1,3‐enyne substrates (see scheme). These types of products, either 1,3‐dienylboronates or 3‐alkynylboronates, are difficult to obtain by other methods. Interestingly, ligand‐controlled borylation was observed with high selectivity in some cases. pin=pinacolato, THF=tetrahydrofuran
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
Neosilyllithium‐Catalyzed Hydroboration of Alkynes and Alkenes in the Presence of Pinacolborane (HBpin)
作者:Gobbilla Sai Kumar、Shruti Moorthy、Himadri Karmakar、Saurabh Kumar Singh、Tarun K. Panda
DOI:10.1002/ejic.202100895
日期:2022.1.18
Catalytic hydroboration of alkynes and alkenes was well demonstrated in the presence of neosilyllithium as catalyst and pinacolborane, under ambient conditions, to form corresponding alkyl boronic ester products in excellent yield. Electron-withdrawing, as well as electron-donating substituents, were well tolerated on the phenyl rings of alkynes and styrenes. Further, aliphatic substituents yielded
Enol Silyl Ethers via Copper(II)-Catalyzed C–O Bond Formation
作者:Daniel G. Chan、David J. Winternheimer、Craig A. Merlic
DOI:10.1021/ol2009297
日期:2011.5.20
Copper(II) acetate catalyzes the coupling of pinacol vinylboronates with silanols producing enol silyl ethers. This represents a novel enol silyl ether synthesis via formation of the C–O bond instead of the conventional Si–O bond. This also constitutes the first transition-metal-catalyzed oxidative cross-coupling with silanols.