Intermolecular Dearomatising Addition of Organolithium Compounds to N-Benzoylamides of 2,2,6,6-Tetramethylpiperidine
作者:Jonathan Clayden、Yann J. Y. Foricher、Ho Kam Lam
DOI:10.1002/1099-0690(200211)2002:21<3558::aid-ejoc3558>3.0.co;2-5
日期:2002.11
N-Benzoylamides of 2,2,6,6-tetramethylpiperidine are not ortholithiated by organolithium compds. but instead undergo nucleophilic addn. of the organolithium compd. to the arom. ring in the manner of a conjugate addn. The resulting dearomatized enolates may be protonated or alkylated, and yield substituted cyclohexadienes in yields of up to 76%. Deprotection of the piperidine ring is possible under
2,2,6,6-四甲基哌啶的 N-苯甲酰胺不被有机锂化合物正锂化。而是进行亲核加成。有机锂化合物 到芳香。以共轭加法的方式环。所得的脱芳构化烯醇化物可以被质子化或烷基化,并以高达 76% 的产率产生取代的环己二烯。在酸性条件下,哌啶环的脱保护是可能的。[在 SciFinder (R) 上]