Practical and General Entry toN‐Tosyl Aryl Aldimines Promoted by Sulfamic Acid in Water and Alcohol
摘要:
A practical, indirect procedure composed of a three-component condensation using aromatic aldehydes, p-tosylamide, and sodium p-toluenesulfinate in the presence of sulfamic acid in tap water-alcohol solvents to afford amidosulfones, and the subsequent water two-phase basic elimination of the amidosulfones to N-tosyl arylimines, was developed. The process has little environmental impact, easy workup, mild reaction conditions, and good yields and is amenable to large-scale preparations.
1,2-Aryl and 1,2-Hydride Migration in Transition Metal Complex Catalyzed Diazo Decomposition: A Novel Approach to α-Aryl-β-enamino Esters
作者:Nan Jiang、Zhaohui Qu、Jianbo Wang
DOI:10.1021/ol016324p
日期:2001.9.1
esters in good yields and high stereoselectivity. The effect of the catalysts on the migratory aptitude of 1,2-aryl over 1,2-hydride migration was studied. A reaction mechanism involving a "bridged" phenoniumion is proposed. Reaction: see text.
The first highly efficient double Friedel–Crafts reaction of N-tosyl imines with anisole, phenol, thioanisole and analogues has been developed to produce the corresponding symmetric diarylmethanes and triarylmethanes with high regioselectivity in the presence of a catalytic amount of Bi2(SO4)3–TMSCl at room temperature.
Lewis Acid-Catalyzed CH Functionalization for Synthesis of Isoindolinones and Isoindolines
作者:Bo Qian、Shengmei Guo、Chungu Xia、Hanmin Huang
DOI:10.1002/adsc.201000556
日期:2010.12.17
The Lewisacid-catalyzed CH functionalization of 2-substituted azaarenes with N-sulfonylaldimines has been developed, which provides a rapid and efficient approach for synthesis of heterocycle-containing isoindolinones and isoindolines.
Design, synthesis, and SAR of cis-1,2-diaminocyclohexane derivatives as potent factor Xa inhibitors. Part II: Exploration of 6–6 fused rings as alternative S1 moieties
derivatives possessing a 6–6 fused ring for the S1 moiety were synthesized as novel factor Xa (fXa) inhibitors. The synthesis, structure–activity relationship (SAR), and physicochemicalproperties are reported herein, together with the discovery of compound 45c, which has potent anti-fXa activity, good physicochemicalproperties and pharmacokinetic (PK) profiles, including a reduced negative food effect
Novel Base-Catalyzed Olefination Methodology. Stereoselective Synthesis of (E)-α-Benzenesulfinylvinylphosphonates
作者:Yanchang Shen、Guo-Fang Jiang
DOI:10.1055/s-2000-6221
日期:——
A novel olefination, catalyzed by base(NaH) and its application to the stereoselectivesynthesis of substituted (E)-α-benzenesulfinyl vinylphosphonates are described.