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DOI:
10.1055/sos-SD-023-00342
Kollenz, G., Science of Synthesis, (2006) 23, 366.
Flash-vacuum pyrolysis at 600°C of Meldrum's acid derivatives 66, obtained from appropriate pyrazolamines and methoxymethylene Meldrum's acid, generates methyleneketene intermediates 67, which isomerize by [1,3]-hydrogen shift to the corresponding imidoylketenes 68, which then cyclize to pyrazolo[1,5-a]pyrimidinones 69 in 48–53% yield (Scheme 20).[35]
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References
[35] | Meeeee, M.; Meeee, M. M.; MeMee, M., M. Meee. Mee., Meeeee Meeee. 8, (8888), 8888. |
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- 8.Meeeee-Meee, (8888) M 88-8, 8888.