作者:Michael Hewlins、Rhys Salter
DOI:10.1055/s-2007-983744
日期:——
An extension of the Pomeranz-Fritsch procedure has been evaluated as a route to some polycyclic azaarenes. Aromatic aldehydes were treated with the dimethyl and diethyl acetals of 2-aminoethanal, the resulting imines reduced to amines which were tosylated and the resulting sulfonamides treated under a range of acidic conditions. The two naphthaldehydes led to benzo[f]isoquinoline and benzo[h]isoquinoline in overall yields of 13% and 36%. Phenanthrene-9-carbaldehyde and phenanthrene-3-carbaldehyde gave dibenzo[f,h]isoquinoline and naphtho[2,1-g]isoquinoline, respectively, as the major tetracyclic products. No pentacyclic product was obtained from a similar sequence starting from pyrene-1-carbaldehyde.
对Pomeranz-Fritsch程序的扩展被评估为获得某些多环氮芳烃的一种途径。芳香醛与2-氨基乙醇的二甲基和二乙基缩醛反应,得到的亚胺还原为胺,然后进行托磺酰化,得到的磺酰胺在一系列酸性条件下处理。两种萘醛分别导致了苯并[f]异喹啉和苯并[h]异喹啉,总产率为13%和36%。菲-9-甲醛和菲-3-甲醛分别得到二苯并[f,h]异喹啉和萘并[2,1-g]异喹啉,作为主要的四环产品。从芘-1-甲醛出发的类似反应序列未能获得五环产品。