An economical, simple, and efficient direct aldol reaction via the double activation of both aldehydes and ketones by ammonia has been developed. An unprecedented tandem Mannich reaction was observed when hydroxybenzaldehydes, pyrrole-2-carboxyaldehyde, and indole-3-carboxyaldehyde were employed to afford 2,2-dimethyl-6-aryl-4-pyrilidinones in moderate to good yields.
Highly efficient chemoselective construction of 2,2-dimethyl-6-substituted 4-piperidones via multi-component tandem Mannich reaction in ionic liquids
作者:Li-Chun Feng、Ya-Wei Sun、Wei-Jun Tang、Li-Jin Xu、Kim-Lung Lam、Zhongyuan Zhou、Albert S. C. Chan
DOI:10.1039/b926498a
日期:——
The room temperature ionicliquid [bmim][PF6] has been demonstrated to be an efficient and recyclable medium for highly chemoselective synthesis of 2,2-dimethyl-6-substituted 4-piperidones via a L-proline catalyzed tandem Mannichreaction of ammonia, aldehydes and acetone, and good yields were achieved for aryl and alkyl aldehydes.