Heterocycle formation through aza-annulation: A stereochemically controlled route to (±)-lupinine.
摘要:
The aza-annulation of an acyclic beta-enaminoester with acryloyl chloride was found to be a very efficient method for nitrogen heterocycle formation. Stereospecific hydrogenation of the unsaturated dihydropyridone generated from aza-annulation gave a single disubstituted lactam product. The cis stereochemical relationship of the substituents was confirmed by transformation of the lactam to (+/-)-lupinine.
Heterocycle formation through aza-annulation: A stereochemically controlled route to (±)-lupinine.
摘要:
The aza-annulation of an acyclic beta-enaminoester with acryloyl chloride was found to be a very efficient method for nitrogen heterocycle formation. Stereospecific hydrogenation of the unsaturated dihydropyridone generated from aza-annulation gave a single disubstituted lactam product. The cis stereochemical relationship of the substituents was confirmed by transformation of the lactam to (+/-)-lupinine.