The condensation of active methylene reagents with salicylaldehyde: Novel synthesis of chromene, azaanthracene, pyrano[3,4-c]chromene and chromeno[3,4-<i>c</i>]pyridine derivatives
作者:Tarek M. Abu Elmaati、Fathi M. El-Taweel、Shymaa M. Elmougi、Abdelghani Elagamey
DOI:10.1002/jhet.5570410502
日期:2004.9
On heating of the cyanoacetic acid cyclopentylidene hydrazide 1 with salicylaldehyde in the presence of bases the azaanthracene derivative 6 was formed. Also, reaction of 3 with malononitrile and ketones 10a,b afforded the pyrano[3,4-c]chromene 9 and chromeno[3,4-c]pyridine 11 respectively. A mechanism for these reactions is proposed.
在碱的存在下,通过将氰基乙酸环戊叉酰肼1与水杨醛一起加热,形成了氮杂蒽衍生物6。同样,使3与丙二腈和酮10a,b反应,分别得到吡喃并[3,4- c ]亚甲基9和色诺[3,4- c ]吡啶11。提出了这些反应的机制。