胡椒碱 在
silica gel 作用下,
以
neat (no solvent, solid phase) 为溶剂,
反应 3.0h,
以82%的产率得到chabamide
参考文献:
名称:
A solvent-free Diels–Alder cycloaddition of piperine on silica gel: synthesis of dimeric amide alkaloid from the roots of Piper nigrum
摘要:
A solvent-free intermolecular Diels-Alder cycloaddition of piperine on silica gel is described. The dimerization of piperine in the presence of silica gel gives better yields than that under the condition of only heating. The new procedure is simple, clean, and easy to operate. It has higher yields and can be completed in short time. (C) 2013 Elsevier Ltd. All rights reserved.
Cobalt(II)-Catalyzed Intermolecular Diels−Alder Reaction of Piperine
作者:Kun Wei、Wei Li、Kazuo Koike、Tamotsu Nikaido
DOI:10.1021/ol050689i
日期:2005.7.1
[reaction: see text] An intermolecular cobalt-phosphine-catalyzed Diels-Alder reaction of piperine is described. The dimerization of piperine in the presence of cobalt-phosphine complexes gave much better yields than that in the presence of only cobalt, which, combined with the result under the purely thermal conditions, indicates that addition of phosphine ligands changes the inhibition of cobalt to