Synthesis of 3-(5-chloropyrazol-3-yl)propenals

Popov, A.; Kobelevskaya, Valentina А.; Ларина, Л. И.; Levkovskaya, G. G.

doi:10.1016/j.mencom.2017.03.024

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Cited by 11 publications

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“…In this case the formylated pyrazole 2o is a minor product while the pyrazole 5 was isolated in 72% yield. We assumed that the latter compound was formed in one-pot tandem reaction sequence via elimination of the hydrogen chloride 30 and following formylation of vinyl moiety of intermediate A, as we have described in our previous work 36 . The target pyrazole 2o undergoes also dehydrochlorination under reaction conditions to afford 5-chloro-1-methyl-3-vinyl-1H-pyrazole-4carbaldehyde 4 in 7% yield (Scheme 4).…”

Section: Resultsmentioning

confidence: 99%