Regioselectivity in Reactions of Bis-Hydrazonoyl Halides with Some Bifunctional Heterocycles
作者:Ahmad S. Shawali、Magda A. Abdallah、Mohie E. M. Zayed
DOI:10.1002/jccs.200200148
日期:2002.12
chloride 1 reacts regioselectively with 3-mercapto-1,2,4-triazole 2a, 2,3-dihydro-3-thioxo-1,2,4-triazin-5(4H)-one 2b and 2-mercaptobenzimidazole 2c to give the hitherto unknown annelated 2,3-bis-(phenylhydrazono)thiazoles 6a-c, respectively. Reactions of 1 with the methylthio derivatives of such heterocycles afforded the annelated 3,3′-bis-(1,2,4-triazoles) 11a-c, respectively. Similar reaction of 1 with
双腙酰氯 1 与 3-mercapto-1,2,4-triazole 2a、2,3-dihydro-3-thioxo-1,2,4-triazin-5(4H)-one 2b 和 2-mercaptobenzimidazole 发生区域选择性反应2c分别给出迄今未知的退火2,3-双-(苯肼基)噻唑6a-c。1 与此类杂环的甲硫基衍生物的反应分别得到退火的 3,3'-双-(1,2,4-三唑) 11a-c。1 与 2-苯基氨基-4(3H)-嘧啶酮 4 的类似反应得到 2,3-双(苯肼基)咪唑并[1,2-a]嘧啶-5(1H)-酮 16。6c 的氧化产生相应的双(苯偶氮) 衍生物 15. 讨论了所研究反应的区域化学。