Synlett 2020; 31(17): 1713-1719
DOI: 10.1055/s-0040-1707189
letter
© Georg Thieme Verlag Stuttgart · New York

An Efficient One-Pot Protocol for Direct Access to Diarylmethyl Thioglycosides with para-Quinone Methides via S-Glycosyl Isothiouronium Salts

Atul Dubey
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow, 226 031, India   eMail: pintuchem06@gmail.com   eMail: pk.mandal@cdri.res.in
,
a   Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow, 226 031, India   eMail: pintuchem06@gmail.com   eMail: pk.mandal@cdri.res.in
b   Academy of Scientific and Innovative Research, New Delhi-11000, India
› Institutsangaben
A. D. thanks UGC, New Delhi for providing Research Fellowship. The author gratefully acknowledges financial support from DST-SERB, New Delhi (Scheme No. EMR/2017/001791) and SAIF Division of CSIR-CDRI for providing the spectroscopic and analytical data. CDRI communication no. 10081.
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Publikationsverlauf

Received: 15. April 2020

Accepted after revision: 16. Juni 2020

Publikationsdatum:
09. Juli 2020 (online)


Abstract

An efficient one-pot protocol has been developed for the direct preparation of diarylmethyl thioglycosides starting from per-O-acetylated sugars via glycosyl isothiouronium salts. The one-pot reaction conditions involve rapid conversion of the per-O-acetylated sugar with thiourea in the presence of boron trifluoride etherate as catalyst to give the corresponding glycosyl isothiouronium salt, which is subsequently treated with a para-quinone methide in the presence of a base to give the a diarylmethyl thioglycoside in excellent yield.

Supporting Information