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.
[reaction: see text] The enantioselective copper(II)-catalyzed Friedel-Crafts addition of indoles to N-sulfonyl aldimines was developed using chiral bisoxazoline as ligands, and high enantioselectivities (up to 96% ee) were achieved.
Pd-catalyzed addition of arylboronic acids to N-tosylarylimines was described by employing easily prepared, air-stable aminophosphine ligands, cheap inorganic base, and common organic solvents, providing diarylmethylamine derivatives through one-pot synthesis in moderate to good yields. The efficiency of this reaction was demonstrated by the compatibility with nitro, trifluoromethyl, fluoro, chloro, and methoxy groups. Moreover, rigorous exclusion of air/moisture is not required in these transformations.
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.
showed good inhibitory activity against fungal strains whereas other derivatives had mild or diminished activity in comparison with standard drug clotrimazole. The antimicrobial study indicated that compounds having electron-withdrawing groups showed the highest activity. Interestingly, these tested compounds showed weak antiviral activity against Vaccinia virus, Human Coronavirus (229E), Reovirus-1
Catalytic Asymmetric Synthesis of Piperidine Derivatives through the [4 + 2] Annulation of Imines with Allenes
作者:Ryan P. Wurz、Gregory C. Fu
DOI:10.1021/ja053277d
日期:2005.9.1
there has been only very limited progress in achieving asymmetric catalysis with chiral phosphines. In this report, the first highly enantioselective variant of the Kwon annulation of imines with allenes is described. Thus, C2-symmetric chiral phosphepine 1 serves as an effective catalyst for this powerful process, furnishing an array of functionalized piperidine derivatives with very good stereoselectivity