Synthesis and stability of 2-methyl-2,4-diaza- and 2-methyl-2,5-diaza-indene (2-methyl-pyrrolo[3,4-b]pyridine and -pyrrolo[3,4-c]pyridine)
作者:W. L. F. Armarego、Beverly A. Milloy、S. C. Sharma
DOI:10.1039/p19720002485
日期:——
2-Methyl-2,4-diaza-(2) and 2-methyl-2,5-diaza-(3) indenes have been prepared by oxidation of 2,3-dihydro-2-methyl-1H-2,4-diaza-(10) and 2,3-dihydro-2-methyl-1 H-2,5- diaza-(14) indene, respectively with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone., They are more stable than 2-methyl-2-azaindene (1) in dilute acid, as neutral species in aqueous solution, and to aerial oxidation, and form stable picrates
通过氧化2,3-二氢-2-甲基-1 H -2,4制备了2-甲基-2,4-二氮杂-(2)和2-甲基-2,5-二氮杂-(3)茚。-重氮-(10)和2,3-二氢-2-甲基-1 H-2,5-二氮杂-(14)茚分别与2,3-二氯-5,6-二氰基-1,4-苯醌。在稀释中比2-甲基-2-氮杂茚(1)更稳定酸,作为水溶液中的中性物质,并向空中氧化,并形成稳定的苦味酸盐。两种二氮杂茚烯(2)和(3)是相对较强的碱。尽管质子化主要发生在N-4和N-5上,以形成共振稳定的阳离子,但氘在稀酸中交换H-1和H-3的难易程度(前者更大)表明,一些像在2-甲基-2-氮杂茚中一样,质子化也分别在C-1和C-3上发生。三种氮杂茚(1)–(3)中H-1和H-3的nmr化学位移表明它们是芳族体系。