A convenient synthesis of 4-substituted 1,2,3,4-tetrahydroisoquinolin-4-ols by a novel intramolecular barbier reaction and by an insertion reaction: reaction scope and limitations
4-Substituted 1,2,3,4-tetrahydroisoquinolin-4-ols were prepared from -(2-iodobenzyl)phenacylamines by an intramolecular Barbier reaction with butyllithium and by an insertion reaction with zerovalent nickel. The scope and limitations of these reactions were discussed.
4-Phenyl-1,2,3,4-tetrahydroisoquinolin-4-ols were prepared by an intramolecular Barbier reaction of N-(2-iodobenzyl)phenacylamines with butyllithium in good yields.
A short route for the synthesis of (+/-) latifine dimethyl ether is reported. The key steps involved are Grignard reaction, conversion of alcohol to nitrile using trimethylsilyl cyanide, reduction of the nitrile intermediate followed by Pictet–Spengler cyclisation and reductive N-methylation in a single step to provide latifine dimethyl ether as a racemate.
Efficient Syntheses of (±)-Cherylline and Latifine Dimethyl Ether
作者:A. Sanjeev Kumar、Samir Ghosh、R. Soundararajan、G. N. Mehta
DOI:10.1080/00397910903109859
日期:2010.5.11
A concise route for the syntheses of (+/-)-cherylline and latifine dimethyl ether is reported. The key steps involved are Michael addition of veratrole with p-methoxy nitrostyrene (for cherylline), anisole with 2,3-dimethoxy nitrostyrene (for latifine), and reduction of nitro intermediate, followed by Pictet-Spengler cyclization.
KIHARA, MASARU;IGUCHI, SEIICHIRO;IMAKURA, YASUHIRO;KOBAYASHI, SHIGERU, HETEROCYCLES, 29,(1989) N, C. 1097-1105