selected as versatile carbene sources, and represents a remarkable synthetic alternative to get access to this class of C2-spiropseudoindoxyl scaffolds. The reactions proceed in the presence of a base and catalytic amounts of benzyl triethylammonium chloride and well-tolerate a broad range of substituents on both aza-aurones and tosylhydrazones to afford a series of C2-spirocyclopropanated derivatives in high
Synthesis of Substituted Pyrido[3,2-<i>b</i>]indoles (δ-Carbolines)
作者:Jean-Yves Mérour、Anne Mérour
DOI:10.1055/s-1994-25566
日期:——
Inverse electron-demand Diels-Alder reaction of ethyl vinyl ether with α,β-ethylenic ketone 1 gave the ethoxypyran 2 which yielded δ-carbolines 3 on exposure to hydroxylamine.