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Updated: Jun 6, 2025

Facile Preparation of 4-Substituted Quinazoline Derivatives
Published on: February 15, 2016
Three-Component Synthesis of Multiply Functionalized 5,6-Dehydroisoquinuclidines through Dearomatization of Pyridine
Kenshin Sano1, Atsunori Mori1,2, Kentaro Okano1
1Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan.
Abstract:
A three-component synthesis of multiply functionalized 5,6-dehydroisoquinuclidines is described. After the formation of an N-alkylpyridinium salt, Grignard addition led to the formation of the corresponding 1,2-dihydropyridine bearing an alkyl, alkene, aryl, or alkynyl group. Subsequent Diels-Alder reaction with a dienophile provided functionalized dehydroisoquinuclidines in high yields (up to 93%) with endo selectivities (73:27 to >99:1). This reaction was applicable to the synthesis of an N-(4-methoxybenzyl)pyridinium salt, where the 4-methoxybenzyl group was switched to a benzyloxycarbonyl group after the formation of the dehydroisoquinuclidine.
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