A solvent-free and efficient synthesis of bicyclic 2-pyridone derivatives for endoplasmic reticulum imaging

A solvent-free method was developed for the synthesis of bicyclic 2-pyridone (DHIP) derivatives, which demonstrated excellent endoplasmic reticulum (ER) targeting and antibacterial activity after a slight structure regulation.

Site-Selective Reaction of Enaminones and Enamine Esters for the Synthesis of Novel Diverse Morphan Derivatives

An efficient and concise protocol was developed for the synthesis of diverse morphan derivatives 5-7 by the Michael and aza-Michael reaction of different types of quinone monoketals 1 or quinone imine ketals 2 with enaminones or enamine esters 3 promoted by 1,8-diazabicyclo[5.4.0]undec-7-ene in acetone at reflux. Notably, when cyclic enaminone 4 was used as a substrate in the aza-Michael and 1,2-addition reactions with quinone monoketals 1, they gave another novel morphan 8. This method is suitable for parallel synthesis of bridged ring compounds. As a result, highly diverse morphan derivatives were easily and efficiently prepared by the Michael/aza-Michael or aza-Michael/1,2-addition reactions.