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Soc."},{"key":"ref11\/cit11b","doi-asserted-by":"crossref","first-page":"2899","DOI":"10.1021\/jo00062a040","volume":"58","author":"Ireland R. E.","year":"1993","journal-title":"J. Org. Chem."},{"key":"ref12\/cit12","doi-asserted-by":"crossref","first-page":"99","DOI":"10.1021\/ja01003a018","volume":"90","author":"Ohno K.","year":"1968","journal-title":"J. Am. Chem. Soc."},{"key":"ref13\/cit13","unstructured":"Yoshida has prepared racemic21(see ref3n) and has shown that it will undergo Heck cyclization under Tietze\u2019s conditions (see ref4e). Mariano has recently reported an enantioselective synthesis of21(see ref4i) but does not report the use of this material in the Heck cyclization."},{"key":"ref14\/cit14","doi-asserted-by":"crossref","first-page":"2631","DOI":"10.1016\/j.tetlet.2007.01.171","volume":"48","author":"Asari A.","year":"2007","journal-title":"Tetrahedron Lett."},{"key":"ref15\/cit15","unstructured":"Royer has independently confirmed the success of the Kuehne Friedel\u2212Crafts reaction. 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