1-硝基-2-萘与α-官能化酮及相关化合物的反应:脱羰2-取代萘[1,2- d ] [1,3]恶唑的意外形成
摘要:
1-亚硝基-2-萘与α-官能化酮如α-溴代,α-氯代,α-甲氧基,α-甲苯磺酰基和α-羟基酮之间的反应在碱性条件下产生了2-取代的萘并[一次合成操作中的1,2- d ] [1,3]恶唑。产物的形成伴随有α-官能化酮中C═O基团的意外损失。以芳基溴化物,烯丙基溴化物,α-溴二酮,α-溴氰化物,α-溴酸酯和α-溴酮酸酯为底物,还观察到了萘并[1,2- d ] [1,3]恶唑的形成。在回流下在1,2-二氯乙烷或乙腈中进行转化,得到相应的萘并恶唑,产率在52%至85%之间。
Microwave-assisted Synthesis of 2-Substituted Naphtho[1,2-d][1,3]oxazoles by Reacting
1-Nitroso-2-naphthol with Allyl Bromides and Benzyl Bromides using FeCl3 as Catalyst
作者:N. Aljaar、S.M. Fraihat、A. Alothman、N.A. Khalaf
DOI:10.14233/ajchem.2020.22745
日期:——
Efficient and improved preparation of 2-substituted[1,2-d][1,3]oxazoles by the reaction of 1-nitroso-2-naphthol and allylbromides, benzylbromides under microwave condition utilizing FeCl3 as a catalyst with yield ranging from 32% to 72%. Reaction with bromo acetonitrile yields the corresponding 2-cyanonaphthoxazole with 58% yield.
Considering their growing attention in the field of medicinal chemistry and drug-discovery research, the facile and convenient approaches towards the preparation of 2-aryl benzoxazole derivatives have been described. The transformation is accomplished by using Fe(III)-catalyzed C–H activation of benzoxazoles with boronic acids to obtain a wide range of C2-arylated benzoxazoles in high yields. The developed