Metal free oxidative halogenation of N-aryl enaminones has been demonstrated using a DMSO–halo acid combination under mild reaction conditions. This strategy allows a facile halogenation of enaminones through α functionalization leading to a broad range of α-halo-N-aryl substituted enaminones in good to excellent yields in a short period of time. Additionally, the use of readily available and inexpensive
Two complementary cascade cyclization reactions were described, namely KHSO4-promoted [1+2+3] cyclization and TMSCl-promoted four-molecular cascade cyclization for the concise synthesis of highly functionalized spirooxindoles in excellent yields. Between them, the improved TMSCl-promoted cyclization reaction of isatins, N,N-dimethylenaminones and amines was carried out to afford various desired products
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.