CBZ6 as a Recyclable Organic Photoreductant for Pinacol Coupling
作者:Hua Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.1c00537
日期:2021.4.16
% CBZ6)-catalyzed reductive (pinacol) coupling of aldehydes, ketones, and imines has been developed. Irradiated by purple light (407 nm) using triethylamine as an electron donor, a variety of 1,2-diols and 1,2-diamines could be prepared. The oxidation potential of the excited state of CBZ6 is established as −1.92 V (vs saturated calomel electrode (SCE)). The relative high reductive potential enables
The intermolecular pinacol-like coupling of optically active imines was performed stereoselectively with metallic samarium and a catalytic amount of iodine to give chiral C 2-2,2′-ethylenediimino-diethanol derivatives.
Ti(O-i-Pr)4/Me3SiCl/Mg reagent mediated McMurry coupling of aryl aldehydes to biaryl olefins at near room temperature. This low valent titanium (LVT) reagent also mediated the coupling of aldimines to 1,2-diamines (imino pinacol coupling).
Ti(O - Pr)4 / Me 3 SiCl / Mg试剂在接近室温的条件下介导的芳基醛与联芳基烯烃的McMurry偶联。这种低价钛(LVT)试剂还介导了亚胺与1,2-二胺的偶联(亚氨基频哪醇偶联)。
Highly Enantioselective Imino Pinacol Coupling Leading to the Synthesis of 1,2-Diphenylethylenediamine Derivatives
作者:Makoto Shimizu、Toyoshi Iida、Tamotsu Fujisawa
DOI:10.1246/cl.1995.609
日期:1995.7
Enantioselective imino pinacol coupling of p-anisylbenzalimine was promoted by the use of Zn-Cu couple in the presence of (+)-camphorsulfonic acid to give (R,R)-1,2-diphenylethylenediamine derivative in high enantiomeric purity.
Symmetrical vicinal (R*,R*)-d,l-diamines were prepared from the corresponding imines and low valent titanium species generated by the action of titanium tetrachloride on amalgamated magnesium.