Generation and Application ofo-Quinone Methides Bearing Various Substituents on the Benzene Ring
作者:Hiromichi Sugimoto、Satoshi Nakamura、Tomohiko Ohwada
DOI:10.1002/adsc.200600508
日期:2007.3.5
o-Quinone methides (o-QMs) are highly reactive, short-lived intermediates, which have potential synthetic applicability. However, few studies on the generation of o-QMs bearing an electron-withdrawing group have been reported. Herein we present a general method for the generation of o-QMs, particularly those substituted with an electrophilic substituent, from new precursors, 4H-1,2-benzoxazines 2.
邻醌甲基化物(o -QMs)是高反应性,寿命短的中间体,具有潜在的合成适用性。但是,关于带有吸电子基团的o -QM的生成的研究很少。本文中,我们介绍了一种从新的前体4 H -1,2-苯并恶嗪2生成o- QM(特别是被亲电取代基取代的邻QM)的通用方法。我们还系统地研究了O - QM与各种亲双烯体(如乙烯基醚,烯胺和亚胺)的Diels-Alder反应。反应为取代的苯并二氢吡喃,苯酚和3,4-二氢-2 H-苯并[e ] [1,3]恶嗪(3,4-二氢-1,3-苯并恶嗪)。此外,我们将新方法应用于某些天然产物的衍生化。