Journal of the Chemical Society. Chemical communications p. 1296 - 1298 (1987)
Update date:2022-08-05
Topics:
Ardill, Harriet
Grigg, Ronald
Sridharan, Visuvanathar
Malone, John
Heating cyclic secondary α-amino acids with an excess of paraformaldehyde or formalin and methyl propiolate or dimethyl acetylenedicarboxylate leads to a decarboxylative ring expansion giving 8- and 9-membered cyclic aza-dienes via an azomethine ylide; the X-ray crystal structure of a substituted 1-azacyclo-octa-2,4-diene shows it to have an irregular tub conformation.
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