Catalytic Asymmetric (3 + 3) Cycloaddition of Oxyallyl Zwitterions with α-Diazomethylphosphonates
作者:Yan Liu、Xian Peng、Rui She、Xin Zhou、Yungui Peng
DOI:10.1021/acs.orglett.1c02809
日期:2021.9.17
The unique structure of oxyallyls represents a significant challenge for their catalyticasymmetric applications. Herein, an unprecedented chiral imidodiphosphoric acid-catalytic enantioselective (3 + 3) cycloaddition between oxyallyl zwitterions generated in situ from α-haloketones and α-diazomethylphosphonates was developed. Pharmaceutically interesting chiral pyridazine-4(1H)-ones were obtained
Micellar systems as supercages for reactions of geminate radical pairs. Magnetic effects
作者:Nicholas J. Turro、Gregory C. Weed
DOI:10.1021/ja00345a031
日期:1983.4
phenyl in DBK also produced magnetic-field-independent behavior, in addition to a dramatic decrease in the efficiency of photolysis. The Cage Effect Spin-correlated (singlet or triplet) and composition-correlated (geminate) radical pairs are produced by thermolysis or photolysis of a variety of organic compounds.' The "cage effectn2 may be defined as the fraction of radical pairs produced that undergo
Nickel-Catalyzed Stereoselective Alkenylation of Ketones Mediated by Hydrazine
作者:Shumei Xia、Dawei Cao、Huiying Zeng、Liang-Nian He、Chao-Jun Li
DOI:10.1021/jacsau.2c00320
日期:2022.8.22
The direct conversion of naturally abundant carbonyl compounds provides a powerful platform for the efficient synthesis of valuable chemicals. In particular, the conversion of ketones to alkenes is a commonly encountered chemical transformation, often achieved via the multistep Shapiro reaction with tosylhydrazone and over stoichiometric organolithium or Grignard reagent. Herein, we report an earth
One-Pot Sequential Hydrogen Isotope Exchange/Reductive Deuteration for the Preparation of α,β-Deuterated Alcohols using Deuterium Oxide
作者:Hengzhao Li、Zemin Lai、Mengqi Peng、Lei Ning、Qixin Dong、Yuxia Hou、Jie An
DOI:10.1021/acs.orglett.2c01940
日期:2022.7.29
An efficient one-pot sequential hydrogen isotope exchange (HIE)/reductive deuteration approach was developed for the preparation of α,β-deuterated alcohols using ketones as the precursors. The HIE step can also be used for the synthesis of α-deuterated ketones. This method has been applied in the synthesis of four deuterated drug and MS internal standards.