Synthesis 2021; 53(01): 135-145
DOI: 10.1055/s-0040-1707245
paper
© Georg Thieme Verlag Stuttgart · New York

MeONH2·HCl-Mediated α-Methylenation/Conjugate Addition of α-Sulfonyl o-Hydroxyacetophenones with Methyl Sulfoxides: Route to 3-Sulfonylchroman-4-ones

a   Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan   eMail: mychang@kmu.edu.tw
b   Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
,
Kuan-Ting Chen
a   Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan   eMail: mychang@kmu.edu.tw
› Institutsangaben
The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan for financial support (MOST 109-2113-M-037-014-MY3).
Weitere Informationen

Publikationsverlauf

Received: 06. Juli 2020

Accepted after revision: 13. Juli 2020

Publikationsdatum:
19. August 2020 (online)


Abstract

A novel and efficient route for the synthesis of 3-sulfonylchroman-4-ones from α-sulfonyl o-hydroxyacetophenones with methyl sulfoxides via a MeONH2·HCl-mediated sequential methylenation/ conjugate­ addition is described. Plausible reaction mechanisms are proposed and discussed. Various reaction conditions for this novel, one-pot, environmentally friendly conversion were investigated.

Supporting Information