Synthesis of Substituted Isoquinolines by Electrophilic Cyclization of Iminoalkynes

The tert-butylimines of o-(1-alkynyl)benzaldehydes and analogous pyridinecarbaldehydes have been cyclized under very mild reaction conditions in the presence of I2, ICl, PhSeCl, PhSCl, and p-O2NC6H4SCl to give the corresponding halogen-, selenium-, and sulfur-containing disubstituted isoquinolines a...

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Bibliographic Details
Published in:Journal of organic chemistry 2002-05, Vol.67 (10), p.3437-3444
Main Authors: Huang, Qinhua, Hunter, Jack A, Larock, Richard C
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Heterocyclic compounds
Heterocyclic compounds with only one n hetero atom and condensed derivatives
Organic chemistry
Preparations and properties
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Summary:The tert-butylimines of o-(1-alkynyl)benzaldehydes and analogous pyridinecarbaldehydes have been cyclized under very mild reaction conditions in the presence of I2, ICl, PhSeCl, PhSCl, and p-O2NC6H4SCl to give the corresponding halogen-, selenium-, and sulfur-containing disubstituted isoquinolines and naphthyridines, respectively. This methodology accommodates a variety of iminoalkynes and affords the anticipated heterocycles in moderate to excellent yields. Monosubstituted isoquinolines and naphthyridines have been synthesized by the metal-catalyzed ring closure of these same iminoalkynes. The silver-catalyzed ring closure is highly effective in cyclizing aryl-, alkenyl-, and alkyl-substituted iminoalkynes at 50 °C.
ISSN:0022-3263
1520-6904
DOI:10.1021/jo020020e