A Novel Route to 1-Substituted 3-(Dialkylamino)-9-oxo-9H-indeno[2,1-c]pyridine-4-carbonitriles
作者:Thomas Landmesser、Anthony Linden、Hans-Jürgen Hansen
DOI:10.1002/hlca.200890033
日期:2008.2
Heptalenecarbaldehydes 1/1′ as well as aromatic aldehydes react with 3-(dicyanomethylidene)-indan-1-one in boiling EtOH and in the presence of secondary amines to yield 3-(dialkylamino)-1,2-dihydro-9-oxo-9H-indeno[2,1-c]pyridine-4-carbonitriles (Schemes 2 and 4, and Fig. 1). The 1,2-dihydro forms can be dehydrogenated easily with KMnO4 in acetone at 0° (Scheme 3) or chloranil (=2,3,5,6-tetrachlorocyclohexa-2
Heptalenecarbaldehydes 1 / 1'以及芳族醛与3-(二氰基亚甲基)茚满反应-1-酮在沸腾的EtOH和仲胺的存在下,得到3-(二烷基氨基)-1,2-二氢-9-氧代-9 H-茚并[2,1 - c ]吡啶-4-腈(方案2和4,以及图1)。1,2-二氢形式可以很容易地用KMnO 4在丙酮中于0°脱氢(流程3)或苯二甲腈(= 2,3,5,6-四氯环己-2,5-二烯-1,4-二酮)进行脱氢。在室温下于二恶烷中进行“一锅法”反应(表1)。茚并[2,1 - c ]吡啶-4-腈的结构通过X射线晶体结构分析已经验证了图5'和图6a(图2和图4)。二氢形式的固有花青素系统在其UV / VIS光谱中产生515-530 nm范围内的较宽吸收带(表2和图3)。脱氢化合物5、5'和7a - 7f在ca处表现出最长的波长吸收最大值。380nm(表2)。与5和5'相反,溶液中的7a - 7f呈现蓝绿色荧光,发射带在460和480