Insights into the unexpected chemoselectivity in Brønsted acid catalyzed cyclization of isatins with enaminones: convenient synthesis of pyrrolo[3,4-c]quinolin-1-ones and spirooxindoles
作者:Hui Xu、Bei Zhou、Pan Zhou、Jie Zhou、Yuehai Shen、Fu-Chao Yu、Ling-Ling Lu
DOI:10.1039/c6cc02659a
日期:——
Divergent cascade syntheses constitute a highly attractive and challenging area in synthetic chemistry, and can exhibit unexpected chemoselectivity. Herein, a Bronsted acid-controlled protocol is described for the efficient catalysis of...
Correction: Insights into the unexpected chemoselectivity in Brønsted acid catalyzed cyclization of isatins with enaminones: convenient synthesis of pyrrolo[3,4-c]quinolin-1-ones and spirooxindoles
作者:Hui Xu、Bei Zhou、Pan Zhou、Jie Zhou、Yuehai Shen、Fu-Chao Yu、Ling-Ling Lu
DOI:10.1039/c6cc90308h
日期:——
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Enantioselective organocatalytic domino synthesis of tetrahydropyridin-2-ols
作者:Jie-Ping Wan、Charles C. J. Loh、Fangfang Pan、Dieter Enders
DOI:10.1039/c2cc35644a
日期:——
The asymmetric synthesis of tetrahydropyridin-2-ols from enals and enaminones is described. The organocatalytic domino reaction involves a Michael addition–hemiaminalization sequence using the Jørgensen–Hayashi catalyst. Dehydration or oxidation leads to the corresponding 1,4-dihydro-pyridines or 3,4-dihydropyridin-2-ones in a one-pot fashion.
An oxidative free-radical C(sp2)–H bond chlorination strategy of enaminones has been developed by using LiCl as a chlorinating reagent and K2S2O8 as an oxidant. This transformation provides a new and straightforward synthetic methodology to afford highly functionalized α-chlorinated enaminones with a Z-configuration in good to excellent yields.
以LiCl为氯化剂、K 2 S 2 O 8为氧化剂,开发了烯胺酮的氧化自由基C(sp 2 )–H键氯化策略。这种转化提供了一种新的、简单的合成方法,以良好至优异的产率提供具有Z构型的高度官能化的 α-氯化烯胺。