Synthesis 2018; 50(12): 2385-2393
DOI: 10.1055/s-0037-1609480
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Isoxazolines and Isoxazoles via Metal-Free Desulfitative Cyclization

Jiaxin Cheng
a   Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: lhe2001@sina.com
,
Ze Yang
a   Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: lhe2001@sina.com
,
Yuansheng Li
a   Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: lhe2001@sina.com
,
Yulan Xi
a   Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: lhe2001@sina.com
,
Qiu Sun*
b   West China Medical Center of Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: sunqiu@scu.edu.cn
,
Ling He*
a   Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan, 610041, P. R. of China   Email: lhe2001@sina.com
› Author Affiliations
We gratefully acknowledge the financial support from the National Science Foundation of China (No. 21072131) and Sichuan University–Lu Zhou Strategic Cooperation Projects (No. 2013 CDLZ-S18).
Further Information

Publication History

Received: 03 February 2018

Accepted after revision: 09 March 2018

Publication Date:
14 May 2018 (online)


Abstract

A novel, one-pot reaction for the synthesis of isoxazolines and isoxazoles is developed via a cascade process under metal-free conditions. The approach involves the formation of intramolecular C–N and C–O bonds and intermolecular C–C bonds from aromatic alkenes or alkynes and N-hydroxysulfonamides using hypervalent iodine(VII) and iodine as the oxidant. Activation of C–H and C–C bonds/construction of C–O bonds/elimination of SO2/C–N bond formation is achieved in sequence­ in the reaction system.