Base catalyzed intramolecular cycloaddition of dialkyl(4-hydroxybutyn-2-yl)[3-(p-tolyl)propyn-2-yl]ammonium chlorides and intramolecular recyclization of the products obtained
摘要:
Dialkyl(4-hydroxybutyn-2-yl)[3-(p-tolyl)propyn-2-yl]ammonium chlorides undergo a diene synthesis type intramolecular cyclization in aqueous base medium to give 2,2-dialkyl-4-hydroxymethyl-6-methyl-benzo[f]isoindolinium chlorides. Under conditions of aqueous base fission intramolecular cyclization of the latter gives 4-dialkylaminomethyl-8-methyl-1,3-dihydronaphtho[1,2-c]furans.
One-Pot Oxidation and Rearrangement of Propargylamines and in Situ Pyrazole Synthesis
摘要:
Reported here are procedures for a one-pot oxidation and rearrangement of propargylamines to synthesize enaminones, with supporting mechanistic studies. Also reported are the extended one-pot syntheses of pyrazoles, including celecoxib and various heterocyclic compounds.
The Use of Propargylamines to Synthesize Amino-1,2,3-triazoles via Cycloaddition of Azides with Allenamines
作者:Luyong Wu、Shanguang Qiu、Wenhao Chen、Dongying Li、Yuxue Chen、Yanning Niu、Yi Wu、Yang Lei、Wenying He
DOI:10.1055/s-0041-1737336
日期:2022.5
A novel reaction of propargylamines with arylazides is designed for the synthesis of 5-amino-1,2,3-triazoles employing a one-pot strategy. In this process, base-mediated isomerization of propargylamines generates allenamine intermediates, which participate in a cyclization reaction with azides. Optimization of the reaction conditions revealed that t-BuOK as the base and DMF as the solvent gave the