The use of enaminones and enamines as effective synthons for MSA-catalyzed regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles
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DOI: 10.1039/c9nj03701b
Abstract: In the present work, an efficient regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles via a methanesulfonic acid (MSA)-catalyzed reaction of hydrazones with enaminones or enamines is reported. read more here.
Keywords: tetrasubstituted pyrazoles; msa catalyzed; synthesis tri; enaminones enamines ... See more keywords
Synthesis of Tri- and Disubstituted Fluorenols and Derivatives Thereof Using Catalytic [2+2+2] Cyclotrimerization
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DOI: 10.3390/catal9110942
Abstract: A method for regioselective synthesis of 2,4-disubstituted and more highly substituted fluorenols using catalytic [2+2+2]cyclotrimerization of mono- and disubstituted diynes with terminal alkynes was explored. In the former case, the preferential formation of the 2,4-regioisomers… read more here.
Keywords: catalytic cyclotrimerization; tri disubstituted; synthesis tri; using catalytic ... See more keywords