LiI/TBHP Mediated Oxidative Cross-Coupling of P(O)-H Compounds with Phenols and Various Nucleophiles: Direct Access to the Synthesis of Organophosphates
Direct phosphorylation of P(O)–H compounds with various nucleophiles such as phenols, alcohols, amines and enols is described using oxidative cross‐coupling strategy. The phosphorylation of hydroxylated naphthyls and heteroarenes has been achieved. Main features of this transformation are short reaction time, functional group tolerance, and broad substrate scope.
Copper(I)-Catalyzed Regio- and Chemoselective Single and Double Addition of Nucleophilic Silicon to Propargylic Chlorides and Phosphates
作者:Chinmoy K. Hazra、Martin Oestreich
DOI:10.1021/ol301827t
日期:2012.8.3
Copper(I)-catalyzed propargylic substitution of linear precursors with (Me2PhSi)2Zn predominantly yields the γ isomer independent of the propargylic leaving group. The thus formed allenylic silane reacts regioselectively with another equivalent of (Me2PhSi)2Zn, yielding a bifunctional building block with allylic and vinylic silicon groups. The reaction rates of both steps are well-balanced for chloride
Catalytic Reductive Cross‐Coupling between Aromatic Aldehydes and Arylnitriles
作者:Atsuhisa Mitsui、Kazunori Nagao、Hirohisa Ohmiya
DOI:10.1002/chem.202100763
日期:2021.4.26
A reductive cross‐coupling reaction between aromatic aldehydes and arylnitriles using a copper catalyst and a silylboronate as a reductant is reported. This protocol represents an unprecedented approach to the chemoselective synthesis of α‐hydroxy ketones by electrophile–electrophile cross‐coupling.
Catalytic Enantioselective Protoboration of Disubstituted Allenes. Access to Alkenylboron Compounds in High Enantiomeric Purity
作者:Hwanjong Jang、Byunghyuck Jung、Amir H. Hoveyda
DOI:10.1021/ol5022417
日期:2014.9.5
Proto-boryl additions to 1,1-disubstituted allenes in the presence of 1.0–5.0 mol % of chiral NHC–Cu complexes, B2(pin)2, and t-BuOH proceed to afford alkenyl–B(pin) products in up to 98% yield, >98:2 site selectivity, and 98:2 er. The enantiomerically enriched alkenylboron products can be converted to otherwise difficult-to-access alkenyl bromides, methylketones or carboxylic acids. What’s more,
Asymmetric synthesis of α-chiral β-hydroxy allenes: copper-catalyzed γ-selective borylative coupling of vinyl arenes and propargyl phosphates
作者:Jung Tae Han、Jaesook Yun
DOI:10.1039/c9cc04165f
日期:——
enantioselective coupling of vinyl arenes with bis(pinacolato)diboron (B2pin2) and propargylic phosphates is presented. The protocol affords a facileroute to enantioenriched α-branched allenes with a versatile pinacolboronate group at the β-position with high enantioselectivity up to 98 : 2 er. In the presence of a copper catalyst complexed with a chiral bisphosphine ligand, catalytic assembly of α-chiral β-hydroxy