Electron deficient dienes I. Normal and inverse electron demand Diels-Alder reaction of the same carbon skeleton
作者:Graham J. Bodwell、Zulan Pi
DOI:10.1016/s0040-4039(96)02340-4
日期:1997.1
The synthesis of compound 11, which features a diene moiety bearing electron withdrawing groups at the 1 and 3 positions, and its completely regioselective inverse electron demand Diels-Alder reactions with 1,1-diethoxyethylene, ethyl vinyl ether and styrene are described. Endo addition is preferred. The direct synthetic precursor of 11, in which one of the electron withdrawing groups (a ketone) is
描述了化合物11的合成,该化合物具有在1和3位带有吸电子基团的二烯部分,及其与1,1-二乙氧基乙烯,乙基乙烯基醚和苯乙烯的完全区域选择性逆电子需求Diels-Alder反应。内酯添加是优选的。11的直接合成前体(其中一个吸电子基团(酮)受保护)参与了正常的电子需求Diels-Alder反应,与1,4-萘醌和N-苯基马来酰亚胺反应,但对1,1-苯并没有反应性二乙氧基乙烯。