Reactions of N- and C-alkenylanilines: VI. Synthesis of 6-methyl-2-[(E or Z)-1-propenyl]anilines and the corresponding anilides and their reaction with bromine
作者:I. S. Afon’kin、A. M. Sotnikov、R. R. Gataullin、L. V. Spirikhin、I. B. Abdrakhmanov
DOI:10.1007/s11178-005-0096-z
日期:2004.12
Isomerization of 2-allyl-6-methylaniline by the action of potassium hydroxide at 300°C afforded cis and trans isomers of 2-methyl-6-(1-propenyl)aniline which were converted into the corresponding carbamates by treatment with ethyl chloroformate. Ethyl 2-methyl-6-(1-propenyl)phenylcarbamates reacted with bromine to give mixtures of 4-(1-bromoethyl)-8-methyl-1,4-dihydro-2H-3,1-benzoxazin-2-one and ethyl 2- methyl-6-(1,2-dibromopropyl)phenylcarbamates. Treatment of the same compounds with N-bromosuccinimide resulted in formation of 2-ethoxy-4H-3,1-benzoxazine derivatives. The reaction of N-6-methyl-2-[(Z)- 1-propenyl]-phenyl}methanesulfonamide gave a mixture of stereoisomeric N-[6-methyl-2- (1,2-dibromopropyl)-phenyl]-methanesulfonamides.
在300°C下,通过氢氧化钾的作用,2-烯丙基-6-甲基苯胺发生异构化,生成顺式和反式的2-甲基-6-(1-丙烯基)苯胺,这些异构体经过与氯甲酸乙酯处理后转化为相应的氨基甲酸酯。乙基2-甲基-6-(1-丙烯基)苯基氨基甲酸酯与溴反应,生成4-(1-溴乙基)-8-甲基-1,4-二氢-2H-3,1-苯并恶唑-2-酮和乙基2-甲基-6-(1,2-二溴丙基)苯基氨基甲酸酯的混合物。用N-溴代琥珀酰亚胺处理相同的化合物,导致形成2-乙氧基-4H-3,1-苯并恶唑啉衍生物。N-6-甲基-2-[(Z)-1-丙烯基]苯基}甲磺酰胺的反应产生了一组立体异构的N-[6-甲基-2-(1,2-二溴丙基)苯基]甲磺酰胺混合物。