An Efficient Route to 2-SubstitutedN-(1-Amino-3-methylpyrrol)amides by Ring-Opening Cyclization of Benzylidene- and Alkylidenecyclopropylcarbaldehydes with Hydrazides
摘要:
A convenient and efficient synthetic method for the construction of 2,3-disubstituted pyrrolamides in moderate to good Yields is established. The in situ generated water significantly accelerates the reaction rate. A possible mechanism involving the cascade ring-opening and thermal-induced rearrangement to produce the five-membered ring is proposed.
Thermally Induced Electrocyclic Reaction of Methylenecyclopropane Methylene Diketone Derivatives: A Facile Method for the Synthesis of Spiro[2.5]octa-3,5-dienes
作者:Xiang-Ying Tang、Yin Wei、Min Shi
DOI:10.1021/ol102002f
日期:2010.11.19
Thermally induced electrocyclic reactions of methylenecyclopropane (MCP) methylene diketone derivatives afford a novel method for the synthesis of spiro[2.5]octa-3,5-dienes in moderate to good yields. Applying this methodology in a one-pot manner for the reactions of MCP aldehydes with 1,3-diketones, catalyzed by l-proline, also afforded the corresponding spiro derivatives.