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
Treatment of aromatic carbonyl compounds with Zn powder in 10% aq NaOH solution without using any organic solvents under the mild conditions afforded the corresponding 1,2-diols in good yields.
The scalable pinacol coupling reaction utilizing the inorganic electride [Ca<sub>2</sub>N]<sup>+</sup>·e<sup>−</sup> as an electron donor
作者:Ye Ji Kim、Sun Min Kim、Hideo Hosono、Jung Woon Yang、Sung Wng Kim
DOI:10.1039/c4cc00802b
日期:——
An inorganic electride [Ca2N]+·e− is used as an efficient electron donor for the scalable pinacol coupling reaction with a high yield.
一种无机电子亚胺[Ca2N]+·e−被用作可扩展的高产率品可醇偶联反应的高效电子给体。
MeOH or H 2 O as efficient additive to switch the reactivity of allylSmBr towards carbonyl compounds
作者:Jianyong Li、Qingsheng Niu、Shanchan Li、Yuehao Sun、Qian Zhou、Xin Lv、Xiaoxia Wang
DOI:10.1016/j.tetlet.2017.01.091
日期:2017.3
aryl ketones mediated by Sm/alkyl halide/MeOH. The results demonstrate that the real reducing species in Sm/alkyl halide/MeOH system should be allylSmBr, and MeOH has elegantly switched the reactivity of allylSmBr from being nucleophilic to being good reductive coupling reagent. Besides, H2O was also found to be a useful additive to realize the pinacol coupling of aliphatic aldehydes and ketones promoted
the meso-stereoisomer as the major product, an unexpected result considering that most organometallic methodologies preferentially yield the dd-isomer. Additionally, the method represents a novel application of the [Cr(en) 2 ] 2+ .