Synthesis and properties of methyl 3,4-dihydro-4-oxo-1H-2-benzothiopyran-3-carboxylate and related thiopyrano-compounds
作者:Richard M. Scrowston、David C. Shaw
DOI:10.1039/p19760000749
日期:——
Methyl 3,4-dihydro-4-oxo-1H-2-benzothiopyran-3-carboxylate (2)[or its tautomer (3)] has been obtained by Dieckmann cyclisation of methyl(o-methoxycarbonylbenzylthio)acetate. It reacts with hydrazine and with phenylhydrazine to give 1,2-dihydro-5H-[2]benzothiopyrano[4,3-c]pyrazol-3-one (7) and the 2-phenyl derivative (6), respectively, but does not give an isoxazolone with hydroxylamine. Methylation
3,4-二氢-4-氧代-1 H -2-苯并噻喃-3-羧酸甲酯(2)[或其互变异构体(3)]是通过对(邻甲氧基羰基苄硫基)乙酸甲酯进行Dieckmann环合获得的。它与肼和苯肼反应,分别得到1,2-二氢-5 H- [2]苯并噻吩并[4,3 - c ]吡唑-3-酮(7)和2-苯基衍生物(6),但是不会与羟胺产生异恶唑酮。已经研究了吡唑啉酮(6)与各种试剂的甲基化。