Cascade synthesis of pyrido[3,2-a]indolizines by reaction of Kröhnke–Mukaiyama salts with malononitrile dimer
作者:Natalia M. Tverdokhleb、Gennadiy E. Khoroshilov、Victor V. Dotsenko
DOI:10.1016/j.tetlet.2014.10.046
日期:2014.11
An efficient protocol for the synthesis of highly functionalized 2-aminoindolizines and pyrido[3,2-a]indolizines has been achieved via the reaction of N-RC(O)CH2-2-chloropyridinium bromides with 2-amino-1,1,3-tricyanopropene in the presence of Et3N. The reaction of N-allyl-2-chloropyridinium bromide with 2-amino-1,1,3-tricyanopropene in the presence of Et3N gives 3-[1-allylpyridin-2(1Н)-ylidene]-2-aminoprop-1-ene-1
通过使N -RC(O)CH 2 -2-氯吡啶鎓溴化物与2-amino-1,1反应,已经获得了一种高效合成高度官能化的2-氨基吲哚并吡啶并[3,2- a ] indolizines的有效方法。在Et 3 N存在下,3-3-三氰基丙烯。在Et 3 N存在下,N-烯丙基-2-氯吡啶溴与2-氨基-1,1,3-三氰基丙烯的反应得到3- [1-1-烯丙基吡啶- 2(1个Н) -亚基] -2-氨基丙-1-烯-1,1,3- tricarbonitrile,这可能被环化,得到[2-氨基- (2-氨基-3- vinylindolizin -1-基)亚甲基KOH-DMF处理后]]丙二腈。