Synthesis 2019; 51(06): 1365-1376
DOI: 10.1055/s-0037-1610317
paper
© Georg Thieme Verlag Stuttgart · New York

Lewis Base Promoted, Direct 1,4-Conjugate Addition to Quinone Imine Ketals: Efficient Access to Unsymmetrical Diaryl Sulfones

Teng Liu*
Center for Yunnan-Guizhou Plateau Chemical Functional Materials and Pollution Control, Qujing Normal University, Qujing 655011, P. R. of China
,
Jianjun Liu
,
Xianfu Shen
,
Jianbin Xu
,
Beifang Nian
,
Ni He
,
Shunqun Zeng
,
Feixiang Cheng*
Center for Yunnan-Guizhou Plateau Chemical Functional Materials and Pollution Control, Qujing Normal University, Qujing 655011, P. R. of China
› Author Affiliations
This work was supported by the Program for the Application of Fundamental Research of Yunnan Province (No. 2018FB019, 2018FD078), Yunnan Local Colleges Applied Basic Research Projects (2017FH001-020), and the National Natural Science Foundation of China (No. 21861032, 21261019).
Further Information

Publication History

Received: 14 October 2018

Accepted: 21 October 2018

Publication Date:
28 November 2018 (online)


New address: College of Materials and Chemical Engineering, Pingxiang University, Pingxiang 337055, China 15288404381@163.com

Abstract

An alternative approach with eco-friendliness and high efficiency for the preparation of unsymmetrical diaryl sulfones has been developed. The strategy takes advantage of the reaction of sulfonyl hydrazides with quinone imine ketals catalyzed by DABCO (triethylenediamine) in ethanol. This transformation proceeds via a Lewis base promoted, direct 1,4-conjugate addition/sulfonylation/alcohol elimination reaction sequence. The protocol provides an efficient approach to access an array of diverse unsymmetrical diaryl and heterodiaryl sulfones, aryl alkyl sulfones and aryl vinyl sulfones in good to excellent yields.

Supporting Information