Aza-Annulation of 1,2,3,4-Tetrahydro-β-carboline Derived Enaminones and Nitroenamines: Synthesis of Functionalized Indolizino[8,7-b]indoles, Pyrido[1,2-a:3,4-b']diindoles, Indolo[2,3-a]quinolizidine-4-ones and Other Tetrahydro-β-carboline Fused Heterocycles

1,2,3,4-四氢-β-咔啉衍生的烯胺酮和硝基烯胺的氮杂环化：功能化吲哚并[8,7-b]吲哚、吡啶并[1,2-a:3,4-b']二吲哚、吲哚并[2,3-a]喹诺里西啶-4-酮和其他四氢-β-咔啉稠合杂环化合物的合成