Synthesis of substituted tetrahydroisoquinolines by lithiation then electrophilic quench
作者:Ruaa A. Talk、Alexia Duperray、Xiabing Li、Iain Coldham
DOI:10.1039/c6ob00577b
日期:——
Substituted N-tert-butoxycarbonyl (Boc)-1,2,3,4-tetrahydroisoquinolines were prepared and treated with n-butyllithium in THF at −50 °C to test the scope of the metallation and electrophilic quench. The lithiation was optimised by using in situ ReactIR spectroscopy and the rate of rotation of the carbamate was determined. The 1-lithiated intermediates could be trapped with a variety of electrophiles
of cyclic amines has been developed that allows a convenient approach to the highly valuable α-amino derivatives. The reaction proceeds via a relay cycle engaging a series of polar and radical processes, triggered by initial access to the key iminium intermediate using only 1–2 mol % of oxidant as initiator. This protocol is practical and sustainable, and shows excellent applicability.
Organocatalytic Asymmetric C–H Vinylation and Arylation of <i>N</i>-Acyl Tetrahydroisoquinolines
作者:Xigong Liu、Shutao Sun、Zhilin Meng、Hongxiang Lou、Lei Liu
DOI:10.1021/acs.orglett.5b00909
日期:2015.5.15
The first organocatalytic enantioselective oxidative C-H functionalization of N-acyl tetrahydroisoquinolines with vinyl and aryl boronates promoted by a chiral Bronsted acid is described. This metal-free process tolerates a wide range of electronically varied N-acyl tetrahydroisoquinolines and structurally diverse boronates with good to excellent enantioselectivities.