Reaction of 1-Nitroso-2-naphthols with α-Functionalized Ketones and Related Compounds: The Unexpected Formation of Decarbonylated 2-Substituted Naphtho[1,2-<i>d</i>][1,3]oxazoles
作者:Nayyef Aljaar、Chandi C. Malakar、Jürgen Conrad、Wolfgang Frey、Uwe Beifuss
DOI:10.1021/jo3022956
日期:2013.1.4
Reactions between 1-nitroso-2-naphthols and α-functionalized ketones such as α-bromo-, α-chloro-, α-mesyloxy-, α-tosyloxy-, and α-hydroxy ketones under basic conditions delivered 2-substituted naphtho[1,2-d][1,3]oxazoles in a single synthetic operation. The product formation was accompanied by the unexpected loss of the C═O group from the α-functionalized ketones. With aryl bromides, allyl bromides
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。