@article {42467,
	title = {Novel synthesis of highly functionalized pyrazolines and pyrazoles by triphenylphosphine mediated reaction of dialkyl azodicarboxylate with allenic esters},
	journal = {Organic Letters},
	volume = {8},
	year = {2006},
	month = {MAY},
	pages = {2213{\textendash}2216},
	type = {Article},
	abstract = {<p>Reaction of the Huisgen zwitterion, derived from triphenylphosphine and dialkyl azodicarboxylate, with allenic esters affords highly functionalized pyrazolines and pyrazoles. The crystal structure of pyrazoline derivative 7a showed extensive C-H{\textperiodcentered}{\textperiodcentered}{\textperiodcentered}O interactions. Pyrazole formation proceeds via a novel nitrogen to carbon migration of the carboalkoxy group.</p>},
	doi = {10.1021/ol0604623},
	author = {Nair, Vijay and Biju, Akkattu T. and Mohanan, Kishor and Eringathodi, Suresh}
}
