A simple synthesis of Δ2-oxazines, Δ2-oxazines, Δ2-thiazolines and 2-substituted benzoxazoles
作者:Helmut Vorbrüggen、Konrad Krolikiewicz
DOI:10.1016/0040-4020(93)80021-k
日期:1993.1
Carboxylic acids react readily at O°→+24°C with amino alcohols, amino mercaptans and o-aminophenols in the presence of triphenylphosphine- or tributylphosphine dichloride (generated from the reaction of the phosphines with hexachloroethane or CCl4) and triethylamine in acetonitrile to form the corresponding Δ2-oxazolines, Δ2-oxazines, Δ2-thiazolines and 2-substituted benzoxazoles in reaction step in
羧酸在三苯基膦或三丁基膦二氯化物(由膦与六氯乙烷或CCl 4的反应生成)和三乙胺在乙腈中的存在下,于0°→+ 24°C易与氨基醇,氨基硫醇和邻氨基酚反应形成相应的Δ 2个-oxazolines,Δ 2个-oxazines,Δ 2 -thiazolines和在2-取代苯并恶唑在高达80%的产率反应步骤。