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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Regio- and Stereoselective Synthesis of Isoindolin-1-ones through BuLi-Mediated Iodoaminocyclization of 2-(1-Alkynyl)benzamides.
Journal of Organic Chemistry 2018 March 17
A simple and straightforward synthesis of isoindolin-1-ones is reported. Exclusive N-cyclization of the amide functional group, an ambident nucleophile, was accomplished for the cyclization of 2-(1-alkynyl)benzamides using n-BuLi-I2 /ICl. The methodology works with the primary amide and affords the desired isoindolinones in yields of 38-94%. Interestingly, the isolated products exhibit a Z-stereochemistry across the C═C double bond. The reaction mechanism involving the formation of either a vinylic anion or an intimate ion pair intermediate is proposed.
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