“Fries like” rearrangement: A novel and efficient method for the synthesis of 6-acyl-2(3H)-benzoxazolones and 6-acyl-2(3H)-benzothiazolones
作者:Huseyin Ucar、Kim Van derpoorten、Paul Depovere、Daniel Lesieur、Majed Isa、Bernard Masereel、Jacques Delarge、Jacques H. Poupaert
DOI:10.1016/s0040-4020(97)10400-8
日期:1998.2
6-acyl-2(3H)-benzoxazolone and 6-acyl-2(3H)-benzothiazolone derivatives have particularly interesting anti-inflammatory, antiepileptic, analgesic and antiviral properties. In this study, we report an original method of acylation on the 6-position of 2(3H)-benzoxazolone and 2(3H)-benzothiazolone which consists in a two-step procedure involving migration of the acyl group from the N-position to the 6-position
6-酰基-2(3 H)-苯并恶唑酮和6-酰基-2(3 H)-苯并噻唑酮衍生物具有特别令人感兴趣的抗炎,抗癫痫,镇痛和抗病毒特性。在这项研究中,我们对第2 6-位酰化报告的原始方法(3 ħ) -苯并恶唑酮和2-(3 ħ)苯并噻唑酮,其包括涉及从酰基迁移的两步骤程序中ñ -在165℃下由AlCl 3催化到杂环的6-位。与以前描述的其他酰化方法相比,发现这种新方法在AlCl 3的消耗和收率(76-90%)方面更为有效。