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.
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.
Indium triflate-catalyzed allylation reactions of N-sulfonyl aldimines or N-alkoxycarbonylamino p-tolylsulfones with allyltrimethylsilane: synthesis of protected homoallylic amines
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1016/j.tet.2010.09.038
日期:2010.11
Indium triflate-catalyzed allylation reactions of N-sulfonyl aldimines or N-alkoxyloxycarbonylamino p-tolylsulfone with allyltrimethylsilane have been successfully developed to produce protected homoallylic amines.
value of the methodology described is demonstrated by providing (a) a direct route for the asymmetricsynthesis of differently substituted 1,2-diamines and (b) a new asymmetricsynthesis of gamma-amino alpha,beta-unsaturated esters through a catalytic, highly enantioselective formal addition of functionalized alkenyl groups to azomethines. Finally, a preferred TS that nicely fits the observed enantioselectivity
Aminoalcohol derivatives by nickel-catalyzed enantioselective coupling of imines and dienol ethers
作者:Jae Yeon Kim、Thomas Q. Davies、Alois Fürstner
DOI:10.1039/d3cc04582j
日期:——
reductive coupling of dienol ethers with N-tosylimines catalyzed by Ni(0) in the presence of a VAPOL-derived phosphoramidite ligand follows an unprecedented regiochemicalcourse; it furnishes syn-configured 1,2-aminoalcohol derivatives in good chemical yields with up to 94% ee.
在 VAPOL 衍生的亚磷酰胺配体存在下,二烯醇醚与N-甲苯磺酰亚胺在 Ni(0) 催化下发生还原偶联,遵循前所未有的区域化学过程;它以良好的化学收率提供顺式构型的 1,2-氨基醇衍生物,其 ee 高达 94%。
Friedel−Crafts Arylation Reactions of <i>N</i>-Sulfonyl Aldimines or Sulfonamidesulfones with Electron-Rich Arenes Catalyzed by FeCl<sub>3</sub>·6H<sub>2</sub>O: Synthesis of Triarylmethanes and Bis-heteroarylarylmethanes
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1021/jo1010137
日期:2010.8.6
The FeCl3 center dot 6H(2)O-catalyzed Friedel-Crafts arylation reactions of N-sulfonyl aldimines or sulfonamidesulfones with electron-rich arenes and heteroarenes, which lead to the formation of triarylmethanes and bis-heteroarylarylmethanes, are developed. The use of mild reaction conditions, low catalytic loading, high yield, and single step synthesis are the advantages of the present procedure.