Tropylium-Promoted Hydroboration Reactions: Mechanistic Insights <i>Via</i> Experimental and Computational Studies
作者:Nhan N. H. Ton、Binh Khanh Mai、Thanh Vinh Nguyen
DOI:10.1021/acs.joc.1c01208
日期:2021.7.2
hydroboration reaction of alkynes. A broad range of vinylboranes can be easily accessed via this metal-free protocol. Similar hydroboration reactions of alkenes and epoxides can also be efficiently catalyzed by the same tropylium catalysts. Experimentalstudies and DFT calculations suggested that the reaction follows an uncommon mechanistic pathway, which is triggered by the hydride abstraction of pinacolborane
Lithium compounds as single site catalysts for hydroboration of alkenes and alkynes
作者:Milan Kumar Bisai、Sandeep Yadav、Tamal Das、Kumar Vanka、Sakya S. Sen
DOI:10.1039/c9cc05783h
日期:——
The hydroboration of alkenes and alkynes using easily accessible lithium compounds [2,6-di-tert-butyl phenolatelithium (1a) and 1,1′ dilithioferrocene (1b)] has been achieved with good yields, high functional group tolerance and excellent chemoselectivity. Deuterium-labeling experiments confirm the cis-addition of pinacolborane. The methodology has been further extended to myrcene, which undergoes
5 mol%) and DABCO (1 mol%) selectively promotes the dehydrogenative borylation of both aromatic and aliphatic terminalalkynes to afford alkynylboronate derivatives in the presence of 1 equiv. of pinacolborane at 100 °C in toluene. This methodology is applicable to a variety of terminalalkynes (16 examples, yield: 62–93%).
Lewis acid catalysis: regioselective hydroboration of alkynes and alkenes promoted by scandium triflate
作者:Souvik Mandal、Piyush Kumar Verma、K. Geetharani
DOI:10.1039/c8cc08361d
日期:——
selective hydroboration of alkynes and alkenes with HBpin (pin = OC-Me2CMe2O) in the presence of a catalytic amount of NaHBEt3 has been developed. This protocol can be applicable to a wide range of substrates including aromatic, aliphatic with cyclic and acyclic side chains, and heteroaryl systems with broad functional-group compatibility. Mechanistic studies revealed that the reaction occurs in a syn fashion
A series of novel phosphonoboronates consisting of PC(1)B, PC(n)B, PC(X)C(n)B, and PCC=CB derivatives were evaluated as MMP-2inhibitors. Structure-activity relationships (SARs) data for the compounds were discovered and are discussed.