作者:Walter Ried、Harald Nenninger
DOI:10.1055/s-1990-26823
日期:——
Synthesis of new 1,3-Oxazinones from Chlorocarbonylketenes and Cyanamides Chlorocarbonylketenes 1a,b react with cyanamides 2a-i under mild conditions to form the 2-amino-1,3-oxazin-4-one derivatives 3a-i and 4 in mostly good yields. Treatment of compounds 3a,f with triethylamine in toluene in the presence of water or with triethylamine and benzylamine in toluene affords N-acylureas 5a,f, 2-amino-1,3-oxazin-4-ones 6, or malonamide 8, depending on the reaction conditions, whereas treatment of 3c with wet toluene leads to the formation of the 2-amino-1, 3-oxazin-6-one 7. Cycloaddition of biscyanmides 9a-c and chlorocarbonylketene 1a leads to the bis-oxazinone derivatives 10a-c in low to moderate yields; in the case of 10a, the monosubstituted product 11a is obtained as a side product.
从氯碳酰基烯酮和氰胺合成新的1,3-氧唑酮。氯碳酰基烯酮1a,b在温和条件下与氰胺2a-i反应,主要以良好的产率形成2-氨基-1,3-氧唑-4-酮衍生物3a-i和4。化合物3a,f在存在水的甲苯中与三乙胺反应,或与三乙胺和苄胺在甲苯中反应,依赖于反应条件,可以得到N-酰基脲5a,f、2-氨基-1,3-氧唑-4-酮6或马隆酰胺8,而将3c与湿甲苯处理则会形成2-氨基-1,3-氧唑-6-酮7。双氰胺9a-c与氯碳酰基烯酮1a的环加成反应生成双氧唑酮衍生物10a-c,其产率为低至中等;在10a的情况下,单取代产物11a作为副产物生成。