The <i>tert</i>-Amino Effect in the Synthesis of Hetaryl- and Arylsulfonyl-Substituted Pyrrolo- and Pyrido[1,2-<i>a</i>]quinoline Derivatives and their Pyrazolo Annulated Analogues
作者:Anton Tverdokhlebov、Alexander Gorulya、Andrey Tolmachev、Alexander Kostyuk、Alexander Chernega、Eduard Rusanov
DOI:10.1055/s-2005-870004
日期:——
cyclization of the corresponding arylidene derivatives. Similarly, starting from 2-(l-piperidinyl)benzaldehydes 5-hetaryl and 5-tosyl-2,3,4,4a,5,6-hexahydro-1H-pyrido[l,2-a]qumoline-5-carbonitriles were obtained. For the hetaryl-substituted derivatives the cyclization step was found to be assisted by protons. In addition 4,5,5a,6,7,8-hexahydro-1H-pyrazolo[3,4-e]indolizine and l,4,5,5a,6,7,8,9-octahydro-pyrazolo[4
4-杂芳基和4-甲苯磺酰基-1,2,3,3a,4,5-六氢吡咯并[1,2-a]喹啉-4-甲腈通过2-(l-吡咯烷基)苯甲醛的缩合反应分两步制备与取代的乙腈 XCH 2 CN (X = 杂芳基,甲苯磺酰基),然后热环化相应的亚芳基衍生物。类似地,从 2-(l-哌啶基)苯甲醛开始,5-杂芳基和 5-甲苯磺酰基-2,3,4,4a,5,6-hexahydro-1H-pyrido[l,2-a]qumoline-5-carbonitriles获得。对于杂芳基取代的衍生物,发现环化步骤由质子辅助。此外还有4,5,5a,6,7,8-六氢-1H-吡唑并[3,4-e]中氮茚和l,4,5,5a,6,7,8,9-八氢-吡唑[4, 3-c]喹啉衍生物通过相同的方法从5-(1-吡咯烷基)-和5-(1-哌啶基)-3-甲基-1-苯基吡唑-4-甲醛开始制备。