First example of Diels–Alder reaction in the 2,3,4,4a-tetrahydroquinoline series. Synthesis of hydrogenated 5,8-ethanoquinolines
作者:Eugeniya V. Nikitina、Victor N. Khrustalev、Dmitry G. Grudinin、Flavien A.A. Toze、Vladimir V. Kouznetsov、Fedor I. Zubkov
DOI:10.1016/j.tet.2010.02.020
日期:2010.4
Diels–Alder reactions in the 2,3,4,4a-tetrahydroquinolines series were studied for the first time. It was shown that these dienes demonstrate only moderate reactivity. [4+2] Cycloaddition occurs stereo- and regioselectively only for alkenes bearing an electron-withdrawing group (acrylonitrile, maleic anhydride, dimethyl acetylene dicarboxylate, methyl propiolate). In this case, endo-Diels–Alder adducts, spiroannelated