SYNTHESIS AND ALKYLATION OF SPIRO-2-OXAZOLINES CONTAINING FUSED 3,4-DIHYDROPYRAZIN-2(1H)-ONES

[摘要]：Spiro-2-oxazolines containing 3,4-dihydroquinoxalin-2(1H)-one, 3,4-dihydrobenzoquinoxalin-2(1H)-one, 1,2-dihydropyrido[2,3-b]pyrazin-3(4H)-one or 5,6-dihydropteridin-7(8H)-one moiety were prepared by heating of aromatic or heteroaromatic diamines with 2-benzoylamino-3-chloropropenoic acid in the presence of triethylamine. Treatment of spiro-2-oxazolines with MeI or EtBr using Bu(4)NHSO(4) and K(2)CO(3) introduced the methyl or ethyl group on the lactam nitrogen atom.

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