Abstract
A simple and general one-pot method for the synthesis of spiro-2H-pyrroles has been developed. Initially, cyclohexane-embedded β-enaminones with internal alkyne functionality were synthesized by conjugate addition of 1-ethynylcyclohexylamine to α,β-alkynic ketones, followed by palladium-catalyzed coupling of the resulting N-propargylic β-enaminones with aryl iodides. When subjected to basic conditions, the cyclohexane-embedded β-enaminones with internal alkyne functionality underwent tandem nucleophilic cyclization and benzylic C–H oxidation to furnish 3,4-diaryloyl-1-azaspiro[4.5]deca-1,3-diene derivatives in good yields.
Key words
pyrrole - 2
H-pyrrole -
N-propargylic β-enaminones - spiro compound - nucleophilic cyclization - benzylic C–H oxidation