3-Alkyl 1,6-dihydropyridines from 3-alkyl 5,6-dihydro-pyridinium salts. Implications in the biosynthesis of some macrocyclic marine alkaloids
作者:Laurent Gil、Alice Gateau-Olesker、Christian Marazano、Bhupesh C. Das
DOI:10.1016/0040-4039(94)02339-d
日期:1995.1
Additions of salts 1 and dihydropyridines 2 in an intramolecular manner have been invoked in the biosynthesis of some macrocyclic alkaloids such as manzamines, sarain A and halicyclamine A, recently isolated from sponges. We report conditions for the deprotonation of easily accessible salts 1, giving a regioselective entry to 3-alkyl 1,6-dihydropyridines 2. Also, we show that species 1 and 2 can be