One-Pot Synthesis of N-Alkyl Sulfonyl Hydrazones by Dialkyl Acetylenedicarboxylate-Mediated Reaction of Trialkylphosphites with Sulfonyl Hydrazones
摘要:
Stable derivatives of N-alkyl sulfonyl hydrazone were obtained in excellent yields from the reaction between electron-deficient acetylenic ester compounds and sulfonyl hydrazones in the presence of trialkylphosphites in dichloromethan at room temperature. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]
Regioselective Synthesis of 1,3,5-Trisubstituted Pyrazoles from <i>N</i>-Alkylated Tosylhydrazones and Terminal Alkynes
作者:Yuanfang Kong、Meng Tang、Yun Wang
DOI:10.1021/ol403447g
日期:2014.1.17
An efficient synthesis of 1,3,5-trisubstitutedpyrazoles from N-alkylated tosylhydrazones and terminal alkynes was developed. The protocol was applied to a wide range of substrates and demonstrated excellent tolerance to a variety of substituents, including both electron-donating and -withdrawing groups. In comparison with the common approaches for substituted pyrazole syntheses, this methodology proceeded
Aluminum Chloride Mediated Reactions of N-Alkylated Tosylhydrazones and Terminal Alkynes: A Regioselective Approach to 1,3,5-Trisubstituted Pyrazoles
作者:Meng Tang、Yun Wang、Hu Wang、Yuanfang Kong
DOI:10.1055/s-0035-1561646
日期:——
Abstract Aluminum chloridemediated reactions of N-alkylated tosylhydrazones and terminal alkynes are reported. The protocol is applied to a wide range of substrates, and demonstrates excellent functional group tolerance. A series of 1,3,5-trisubstituted pyrazoles is prepared in good to high yields with complete regioselectivity. Aluminum chloridemediated reactions of N-alkylated tosylhydrazones and
Regioselective Synthesis of Highly Functionalized Pyrazoles from <i>N</i>-Tosylhydrazones
作者:Qian Zhang、Meng Tang
DOI:10.1021/acs.orglett.9b00561
日期:2019.3.15
A regioselectivesynthesis of highly functionalized pyrazoles from N-tosylhydrazones was developed. The reaction was general for a wide range of substrates and demonstrated excellent tolerance to a variety of substituents, and the method has been successfully applied to the formal synthesis of ibrutinib.