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An efficient synthesis of pyrazolo[1,5-a]quinazolin-5(4H)-ones and pyrazolo[1,5-a]pyrido[3,2-e]pyrimidin-5(4H)-ones is reported from the reaction of 2-haloaroyl chlorides with 5-amino-1H-pyrazoles. The reaction takes advantage of the 1,3-disposition of electrophilic centers in the acid chloride and the similar arrangement of nucleophilic sites in the pyrazole to form the central six-membered ring...
An efficient and inexpensive approach to the synthesis of 2-substituted and 2,5-disubstituted 1,3,4-oxadiazoles from arylhydrazides and orthoesters is reported using catalytic NH 4 Cl. The conditions are mild, and thus, compatible with a variety of functional groups. The optimized reaction is performed using 30mol% of NH 4 Cl in 100% EtOH and is generally complete within 1h for non-aromatic...
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