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By contrast, the reactions of 6<jats:sup>A<\/jats:sup>\u2010deoxy\u20106<jats:sup>A<\/jats:sup>\u2010propynamido\u2010\u03b2\u2010cyclodextrin with 4\u2010<jats:italic>tert<\/jats:italic>\u2010butylbenzonitrile oxide and 4\u2010phenylbenzonitrile oxide afford &gt;90\u2009% and approximately 85\u2009% of the corresponding 3,4\u2010disubstituted isoxazoles, respectively. As well as reversing the regioselectivity, the cyclodextrin increases the rates of these cycloadditions. The extent of the acceleration is up to more than three orders of magnitude for the production of the cycloadduct preferred by the cyclodextrin, but even the rate of reaction to give the less favored regioisomer is increased. With 6<jats:sup>A<\/jats:sup>\u2010deoxy\u20106<jats:sup>A<\/jats:sup>\u2010propynamido\u2010\u03b2\u2010cyclodextrin, the cycloadducts are not easily separated from the cyclodextrin, as the amide bond is not readily cleaved. In comparison, the regioselectivity of the cycloadditions of 4\u2010<jats:italic>tert<\/jats:italic>\u2010butylbenzonitrile oxide with acrylic acid, methacrylic acid, and crotonic acid is also altered by formation of the corresponding cyclodextrin esters, by factors of 500, &gt;10, and &gt;100, respectively. The rates of cycloaddition are also increased by up to 475 times, and in these cases the products of cycloaddition are readily released from the cyclodextrin through ester hydrolysis. Incorporating these processes into a reaction cycle, acylation of \u03b2\u2010cyclodextrin with <jats:italic>p<\/jats:italic>\u2010nitrophenyl acrylate and subsequent treatment first with 4\u2010<jats:italic>tert<\/jats:italic>\u2010butylbenzonitrile oxide and then with base, the latter to catalyze ester hydrolysis and regenerate the \u03b2\u2010cyclodextrin, affords proportionally fivefold more of the 3,4\u2010disubstituted isoxazoline than is produced directly from acrylic acid.<\/jats:p>","DOI":"10.1002\/chem.200600627","type":"journal-article","created":{"date-parts":[[2006,9,18]],"date-time":"2006-09-18T04:54:21Z","timestamp":1158555261000},"page":"8571-8580","source":"Crossref","is-referenced-by-count":24,"title":["Reversal of Regioselectivity and Enhancement of Rates of Nitrile Oxide Cycloadditions through Transient Attachment of Dipolarophiles to 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