2-Cyano-.DELTA.3-piperideines. 12. Stereochemistry of formation of N-benzyl-2-cyano-.DELTA.3-piperideines and facile isomerization on alumina to 2-cyano-.DELTA.4-piperideines. A potentially general route to the synthesis of 2,6-disubstituted piperidine alkaloids
2-Cyano-.DELTA.3-piperideines. 12. Stereochemistry of formation of N-benzyl-2-cyano-.DELTA.3-piperideines and facile isomerization on alumina to 2-cyano-.DELTA.4-piperideines. A potentially general route to the synthesis of 2,6-disubstituted piperidine alkaloids
A convenient racemic synthesis of two isomeric tetrahydropyridyl alkaloids: Isoanatabine and anatabine
作者:Anne Rouchaud、William R. Kem
DOI:10.1002/jhet.359
日期:——
contributed to the knowledge of the mechanism of this oxidative rearrangement. On the other hand, the reduction of 1‐methylpyridinium iodide with sodium borohydride and with potassium cyanide present since the start of the reaction in a two layer ether‐water system, gave 2‐cyano‐1‐methyl‐4‐piperideine. This was transformed into (±)‐anatabine by the same sequence of reactions used for the synthesis of (±)‐isoanatabine
Regioselective addition of organozinc reagents to 5,6-dihydropyridinium ions and synthetic equivalents. Factors effecting 1,2-versus 1,4-selectivity
作者:Jean Luc Bettiol、Richard J. Sundberg
DOI:10.1021/jo00056a007
日期:1993.2
Organozinc reagents undergo nucleophilic addition to 5,6-dihydropyridinium ions with 1,2-versus 1,4-regioselectivity depending on the structure of the organic group and the presence of magnesium salts. Addition of organozinc reagents to 2-cyano-5,6-dihydropyridines, which are synthetic equivalents of 5,6-dihydropyridinium ions, gives exclusively 1,2-addition products.
2-Cyano Δ3piperideine VII1 : the condensation of 2-cyano Δ3piperideine with sodium dimethylmalonate catalyzed by ZnCl2 or zero valent palladium and platinum complexes
作者:François Guibe、David S. Grierson、Henri-Philippe Husson