Synthesis 2020; 52(09): 1425-1434
DOI: 10.1055/s-0037-1610750
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of 4-Vinyl-1,2,3,4-tetrahydroisoquinoline from N-Tethered Benzyl-Alkenol Catalyzed by Indium(III) Chloride: Formal Synthesis of (±)-Isocyclocelabenzine

Ngangbam Renubala Devi
,
Sudip Shit
,
Bipin Kumar Behera
,
Anil K. Saikia
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India   Email: asaikia@iitg.ac.in
› Author Affiliations
This work was supported by Council of Scientific & Industrial Research (CSIR), New Delhi (grant no. 02(0364)/19/EMR-II).
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Publication History

Received: 20 December 2019

Accepted after revision: 20 January 2020

Publication Date:
12 February 2020 (online)


Abstract

An intramolecular Friedel–Crafts cyclization reaction catalyzed by indium(III) chloride for the formation of 4-vinyl-1,2,3,4-tetrahydroisoquinoline from N-tethered benzyl-alkenol in good yields has been described. The reaction is highly regioselective and generates an exocyclic vinyl functionality in the piperidine ring. The reaction is compatible with a wide range of functional groups. The strategy is demonstrated for the formal synthesis of (±)-isocyclocelabenzine alkaloid.

Supporting Information