Synthesis of 5-Amino-1,10b-dihydro-2H-chromeno[3,4-c]pyridine-2,4(3H)-diones from Coumarins and Cyanoacetamides under Basic Conditions
作者:Ornelio Rosati、Massimo Curini、Maria Marcotullio、Caroline Pelucchini、Antonio Procopio、Gildas Oball-Mond
DOI:10.1055/s-0029-1217128
日期:2010.1
The reaction of various coumarins with cyanoacetamide derivatives under basic conditions (sodium ethoxide, piperidine or 2,2,6,6-tetramethylpiperidine), proceeds via an interesting process which involves skeletal rearrangement of the coumarin, a Michael addition and two cyclizations to afford 5-amino-1,10b-dihydro-2H-chromeno[3,4-c]pyridine-2,4(3H)-diones. The same reaction in the presence of N,N¢-ethane-1
各种香豆素与氰基乙酰胺衍生物在碱性条件下(乙醇钠,哌啶或2,2,6,6-四甲基哌啶)的反应是通过一个有趣的过程进行的,该过程涉及香豆素的骨架重排,迈克尔加成和两个环化反应得到5 -氨基-1,10b-二氢-2 H-苯并[3,4- c ]吡啶-2,4(3 H)-二酮。在N,N ¢-乙烷-1,2-二基双(2-氰基乙酰胺)存在下的相同反应,得到相应的单和双5-氨基-1,10b-二氢-2 H -chromeno [3,4- c ]吡啶-2,4(3 H)-二酮。 香豆素-迈克尔加成-杂环-环化-chromenes