Intramolecular [4 + 2] cycloaddition reactions of pyridazino-[4,5-<i>d</i>]pyridazines with acetylenic side-chain dienophiles: Synthesis of<i>f</i>-annelated phthalazines
作者:Norbert Haider、Claudia Loll
DOI:10.1002/jhet.5570310217
日期:1994.3
Starting from the thione 1, a series of 1-(alkynyl-X)-4-phenylpyridazino[4,5-d]pyridazines 4–8 (X = 0, NH, S) was prepared. Thermally induced intramolecular [4+2] cycloaddition reactions of the ethers 4, 5 and the thioether 8 afforded f-annelated phthalazine derivatives.
从硫酮1开始,制备了一系列1-(炔基-X)-4-苯基哒嗪并[4,5- d ]哒嗪4-8(X = 0,NH,S)。醚4、5和硫醚8的热诱导的分子内[4 + 2]环加成反应提供了f-退火的酞嗪衍生物。