NDLI: La(OTf) 3 catalyzed reaction of salicylaldehyde phenylhydrazones with β-ketoesters and activated alkynes: facile approach for the preparation of chromenopyrazolones

Content Provider	Semantic Scholar
Author	Hariprasad, Kurma Siva Prasad, Kasagani Veera Raju, Bhimapaka China
Copyright Year	2016
Abstract	A facile approach has been developed for the preparation of chromenopyrazolones (5a–o, 7a–k) by the reaction of salicylaldehyde phenylhydrazones (3a–o) with β-ketoesters (4a, 4f–g) and activated alkynes (6a–e) in the presence of La(OTf)3 with good yields. However, the reaction of salicylaldehyde phenylhydrazones (3a, 3c, 3j–k, 3n) with ethyl 4-chloro-3-oxobutanoate (4e) underwent cyclization with reductive dechlorination and provided the methyl chromenopyrazolones instead of chloromethyl chromenopyrazolones. The present solvent free protocol provided the novel heterocyclic compounds.
Starting Page	108654
Ending Page	108661
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1039/C6RA21717F
Volume Number	6
Alternate Webpage(s)	http://www.iictindia.org/staffprofiles/PublicationFiles/iict1205Publications.pdf
Alternate Webpage(s)	http://www.rsc.org/suppdata/c6/ra/c6ra21717f/c6ra21717f1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C6RA21717F
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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