Synthesis of enantiomerically enriched indolines and tetrahydroisoquinolines from (S)-amino acid-derived chiral carbocations: an easy access to (3S,4R)-demethoxy-3-isopropyl diclofensine
作者:Sudipta Kumar Manna、Gautam Panda
DOI:10.1039/c4ob00922c
日期:——
Enantiomerically enriched indolines and tetrahydroisoquinolines were synthesized within 5 min to 2 h in high yields from easily accessible (S)-amino acid derived chiral carbocations. The diastereoselective Friedel–Crafts reaction is promoted by a Lewis acid (AlCl3) offering trans-diastereoselectivity. The rate of the reaction and diastereoselectivity of the product are significantly influenced by steric
Copper catalyzed coupling of aryl chlorides, bromides and iodides with amines and amides
作者:Hanhui Xu、Christian Wolf
DOI:10.1039/b823407h
日期:——
A copper(I) catalyzed procedure for carbon–nitrogen bond formation utilizing aryl halides and either amines, including amino acids and diphenylamine, or aliphatic and aromatic amides is described.
Development of a Method for the <i>N</i>-Arylation of Amino Acid Esters with Aryl Triflates
作者:Sandra M. King、Stephen L. Buchwald
DOI:10.1021/acs.orglett.6b02082
日期:2016.8.19
N-arylation of aminoacidesters with aryl triflates is described. Both α- and β-amino acidesters, including methyl, tert-butyl, and benzyl esters, are viable substrates. Reaction optimization was carried out by design of experiment (DOE) analysis using JMP software. The mild reaction conditions, which use t-BuBrettPhos Pd G3 or G4 precatalyst, result in minimal racemization of the aminoacidester. This method