Reduction of nitro- and nitroso-compounds by tervalent phosphorus reagents. Part XV. Reactions of certain aryl 2-nitrophenyl sulphides and their 2-azido-analogues leading to evidence for the intermediacy of 2,3-dihydro-1,3,2-benzothiazaphosph(V)oles (thiazaphosphoranes) and to the formation of dihydrodimethylphenothiazinones and pyrimido- and pyrido-[1,2-b]indazoles
作者:J. I. G. Cadogan、Brian S. Tait
DOI:10.1039/p19750002396
日期:——
Deoxygenation by triethyl phosphite and, in two cases, by trimethyl phosphite, of aryl 2-nitrophenyl sulphides [aryl = 2,6-Me2C6H3, 2,4,6-Me3C6H2, 2,6-(MeO)2C6H3, 2,4,6-(MeO)3C6H2, 2,5-(MeO)2C6H3, 2-MeO·C6H4, or 4-MeC6H4] gave, in addition to various heterocycles described previously, appreciable yields (6–87%) of dialkyl N-2-alkylthiophenyl-N-arylphosphoramidates, e.g.(9), where the alkyl group is
由亚磷酸三乙酯和脱氧,在两种情况下,由亚磷酸三甲酯的芳基2-硝基苯基硫化物,[芳= 2,6-ME 2 ç 6 ħ 3,2,4,6--ME 3 c ^ 6 ħ 2,2,6- - (MEO)2 C ^ 6 ħ 3,2,4,6-(MEO)3 c ^ 6 ħ 2,2,5-(MEO)2 C ^ 6 ħ 3,2-的MeO·C 6 H ^ 4,或4-除上述各种杂环外,MeC 6 H 4 ]还产生了可观的产率(6-87%)的二烷基N-2-烷基硫代苯基-N-芳基膦酰胺酸酯,例如(9),其中烷基衍生自亚磷酸酯并且芳基如上。这些氨基磷酸酯中的某些先前被错误地分配为异构的二烷基N-烷基-N-(2-芳硫基苯基)氨基磷酸酯结构,例如(6),因此先前被认为是不重要的和预期的副产物[ArNO 2 +(RO )3 P→(RO)2 P(O)NRAr]。当前结构的重新分配指向2,2-二氢-1,3,2-苯并噻唑磷(V)的中间体,