N-(arylsulphonyl)tetrahydropyridinium salts: intermediates for multi-ring heterocycles. Part 1. Synthesis of hexahydropyrido[1,2-b][1,2,4]benzothiadiazine dioxides
作者:Babajide I. Alo、Oluwole B. Familoni
DOI:10.1039/p19900001835
日期:——
N-(Arylsulphonyl)tetrahydropyridinium salts were obtained regiospecifically and in high yield by smooth triflate-assisted decarbonylation of the corresponding N-(arylsulphonyl)piperidine-2-carboxylic acid chlorides at room temperature. These synthons were converted into the nitroamines, which reductively cyclocondensed to give the new 9-substituted tricyclic azacycles, hexahydropyrido[1,2-b][1,2,4]benzothiadiazine
Ñ被区域专一性和在由相应的三氟甲磺酸酯光滑辅助脱羰基高收率得到(芳基磺酰)tetrahydropyridinium盐- Ñ(芳基磺酰基)在室温下哌啶-2-羧酸氯化物- 。这些合成子被转化为硝胺,后者被还原性环缩合,得到新的9-取代的三环氮杂环,六氢吡啶并[1,2- b ] [1,2,4]苯并噻二嗪6,6-二氧化物。