Synthesis of a new series of indolinic aminoxyls. Reaction of indoles, 2-phenylbenzothiazole, 2-phenylbenzoxazole and 2-phenyl-1,2-dihydro-4H-3,1-benzoxazin-4-one with organolithium reagents
作者:Giampaolo Tommasi、Paolo Bruni、Lucedio Greci、Paolo Sgarabotto、Lara Righi、Rita Petrucci
DOI:10.1039/a904092g
日期:——
2-Alkyl-2-phenyl-3,3-dimethylindolines, obtained by 1,2 organolithium addition to 2-phenyl-3,3-dimethyl-3H-indole, are converted into a new series of aminoxyls by oxidation with m-chloroperoxybenzoic acid. Attempts to synthesise, in a similar way, suitable precursors such as 1,2-dihydro-2-phenyl-2-alkylbenzothiazole, 1,2-dihydro-2-phenyl-2-alkylbenzoxazole and 1,2-dihydro-2-phenyl-2-alkyl-4H-3,1-benzoxazin-4-one for other new aminoxyls failed. In fact, 2-phenylbenzothiazole, 2-phenylbenzoxazole and 2-phenyl-4H-3,1-benzoxazin-4-one react with organolithium reagents affording products deriving from ring opening. Crystal structures of 2,3-dimethyl-3-phenyl-3H-indole and bis(2-triphenylmethylaminophenyl) disulfide are also described.
2-烷基-2-苯基-3,3-二甲基吲哚啉通过对2-苯基-3,3-二甲基-3H-吲哚进行1,2烷基锂加成获得,随后用对氯过苯甲酸氧化转化为一系列新的氨氧基化合物。尝试以类似方式合成适合的前体,如1,2-二氢-2-苯基-2-烷基苯并噻唑、1,2-二氢-2-苯基-2-烷基苯并噁唑和1,2-二氢-2-苯基-2-烷基-4H-3,1-苯并氧杂烯-4-酮等新氨氧基化合物未能成功。实际上,2-苯基苯并噻唑、2-苯基苯并噁唑和2-苯基-4H-3,1-苯并氧杂烯-4-酮与烷基锂试剂反应,生成来自环开裂的产物。此外,还描述了2,3-二甲基-3-苯基-3H-吲哚和双(2-三苯基甲基氨基苯基)二硫化物的晶体结构。