Triethylamine–Mesyl Chloride/Thionyl Chloride: A Reagent for Hydrodebromination of Diquinane-Based α-Bromo-γ-Lactones

Chintada, N R and Khan, Faiz Ahmed (2015) Triethylamine–Mesyl Chloride/Thionyl Chloride: A Reagent for Hydrodebromination of Diquinane-Based α-Bromo-γ-Lactones. Synthesis, 47 (19). pp. 3027-3035. ISSN 0039-7881

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Abstract

A selective debromination of tetracyclic dibrominated bis-γ-lactones in the presence of triethylamine and mesyl chloride is reported. Both mesyl chloride and triethylamine are essential for the debromination process. The reduction is proposed to proceed through halophilic substitution of electrophilic bromine. The source of the halophile in this reaction is believed to be triethyl(mesyl)ammonium chloride. The nonoccurrence of debromination in dibromo bis-γ-lactones with tosyl chloride and triethylamine as reagents suggests that the formation of a source of well-dissociated chloride ions during the reaction is necessary. Furthermore, selective debromination of dibrominated bis-γ-lactones was also achieved by using pyridine–thionyl chloride as a reagent. Alternatively, potassium chloride–[18-crown-6] was demonstrated to be a suitable source of chloride ion for the reduction of bromolactones.

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IITH Creators:
IITH CreatorsORCiD
Khan, Faiz AhmedUNSPECIFIED
Item Type: Article
Additional Information: Supporting information for this article is available online at http://dx.doi.org/10.1055/s-0034-1378843
Uncontrolled Keywords: lactones,polycycles,debrominations
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 31 Jul 2015 07:17
Last Modified: 21 Sep 2017 06:29
URI: http://raiithold.iith.ac.in/id/eprint/1743
Publisher URL: https://doi.org/10.1055/s-0034-1378843
OA policy: http://www.sherpa.ac.uk/romeo/issn/0039-7881/
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