Copper-Catalyzed Perkin–Acyl-Mannich Reaction of Acetic Anhydride with Pyridine: Expeditious Entry to Unconventional Piperidines
作者:Stefano Crotti、Francesco Berti、Mauro Pineschi
DOI:10.1021/ol202027k
日期:2011.10.7
A regioselective introduction of a methoxycarbonyl methyl group at the C2 position of unsubstituted pyridine has been accomplished with catalytic amounts of copper(II) triflate in mild reaction conditions. The N-acetyl-1,2-dihydropyridyl aceticacid methyl ester obtained is a valuable building block for the synthesis of new polyfunctionalized piperidine derivatives bearing unconventional substitution
Synthesis of Protected (1-Phenyl-1<i>H</i>-pyrrol-2-yl)-alkane-1-amines from Phenylnitroso Diels–Alder Adducts with 1,2-Dihydropyridines
作者:Francesco Berti、Valeria Di Bussolo、Mauro Pineschi
DOI:10.1021/jo4009996
日期:2013.7.19
The reductive cleavage of nitrosobenzene-derived cycloadducts with appropriately protected 1,2-dihydropyridines allows a novel and simple obtainment of substituted N-[1-(1-phenyl-1H-pyrrol-2-yl)alkylamides. This synthesis can also be carried out in a very simple, mild, and practical one-pot procedure without isolation of the corresponding nitrosobenzene cycloadduct by means of catalytic amounts of
An unexpected reaction of pyridine with acetyl chloride to give dihydropyridine and piperidine derivatives
作者:Pietro Spanu、Alberto Mannu、Fausta Ulgheri
DOI:10.1016/j.tetlet.2014.02.006
日期:2014.3
An unexpected reaction of pyridine with acetylchloride to give N-acetyl-1,2 and 1,4-dihydropyridyl acetic acid (1, 2) in high yield and regioselectivity has been reported. The key step is the formation of a zwitterionic pyridinium ketene enolate. The effect of different activating agents on the reaction yield and selectivity has been studied. Platinum(IV) mediated hydrogenation of the corresponding