cyclopropenes 10 to form tetracyclic azocompounds 12. Photolysis of these compounds, with accompanying loss of nitrogen, affords homotropilidenes (bicyclo[5.1.0]octa-2,5-dienes) 13−26. Substituents at various positions of the homotropilidene skeleton have been observed to exert significant influences on the Cope rearrangement rate and, in cases of unsymmetrically substituted homotropilidenes, on the
The synthesis of a new class of stable coloured azomethineylides 3 derived from 3,4-diazanorcaradienes is reported, which under acid catalysis are transformed to again coloured stable azomethineylides 4 containing a five-membered 1-aza-1,3-cyclopentadiene skeleton. Azomethineylides 3 in boiling methanol rearrange to 3,5-diazahomotropilidenes 8 in good yields.
Cycloadditions of 3,4-diazanorcaradienes with benzyne and 1-diethylaminopropyne
作者:Rudi E. Moerck、Merle A. Battiste
DOI:10.1039/c39720001171
日期:——
Cycloaddition of benzyne and 1-diethylamino-propyne with 2,5-disubstituted-3,4-diazanorcaradienes (1) affords, after nitrogen extrusion, cycloheptatriene derivatives (3a–c) and (4a) and as such constitutes a new synthetic route to cyclohepta-1,3,5-trienes.