Preparation of New Nitrogen-Bridged Heterocycles. 5. Smooth Michael Additions of 2(3<i>H</i>)-Indolizinone Derivatives
作者:Akikazu Kakehi、Suketaka Ito、Bunzo Wada、Kozo Watanabe、Kenji Nishimura、Aiichiro Kumagai
DOI:10.1246/bcsj.55.3590
日期:1982.11
some 2(3H)-indolizinone derivatives to α,β-unsaturated nitriles, esters, and an amide gave the corresponding double Michael adducts, 3,3-disubstituted 2(3H)-indolizinones, in moderate to high yields, and those to methyl vinyl ketone afforded further condensed products, spiro[cyclohexane-1,3′(2′H)-indolizin]-2′-ones, instead of the expected 1:2 adducts. On the other hand, the reactions of the indolizinones
一些 2(3H)-吲哚嗪酮衍生物与 α,β-不饱和腈、酯和酰胺的迈克尔加成得到相应的双迈克尔加合物,3,3-二取代的 2(3H)-吲哚嗪酮,产率中等至高,和那些与甲基乙烯基酮的反应提供了进一步的缩合产物,螺[环己烷-1,3'(2'H)-indolizin]-2'-酮,而不是预期的 1:2 加合物。另一方面,吲哚嗪酮与在 β 位具有适当离去基团的活化乙烯或炔酯的反应形成不稳定的 1:1 迈克尔加合物,其转化为稳定的 2-酰氧基-或 2-烷氧基-通过用一些酰化剂或烷化剂以相对较好的收率处理得到 3-乙烯基吲哚嗪衍生物。