Triphenylphosphine promoted reactions between 3-arylideneoxindoles and (delta-aryl-substituted penta-2,3-dienoates afford an unprecedented access to spirocyclic oxindoles with functionalized six-membered rings. In these new [4 + 2] cyclization processes, the allenoates operate as the four-carbon synthons, thanks to the involvement of the substituted (delta-carbons. These reactions give excellent control of the relative stereochemistry of the three stereogenic centers. The stereochemistry of the final product has been ascertained by X-ray diffraction studies.
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[Anonymous], 2008, CCDC 897144 (51) and CCDC 897143 (7) contain the Supplementary crystallographic data for this Letter, Patent No. [2008055812, 2008/055812]
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Alma Mater Studiorum Univ Bologna, Dipartimento Chim Organ A Mangini, I-40136 Bologna, ItalyAlma Mater Studiorum Univ Bologna, Dipartimento Chim Organ A Mangini, I-40136 Bologna, Italy
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[Anonymous], 2008, CCDC 897144 (51) and CCDC 897143 (7) contain the Supplementary crystallographic data for this Letter, Patent No. [2008055812, 2008/055812]
机构:
Alma Mater Studiorum Univ Bologna, Dipartimento Chim Organ A Mangini, I-40136 Bologna, ItalyAlma Mater Studiorum Univ Bologna, Dipartimento Chim Organ A Mangini, I-40136 Bologna, Italy
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Wu, Li-Yuan
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Zhengzhou Univ, Dept Chem, Henan Key Lab Chem Biol & Organ Chem, Zhengzhou 450052, Peoples R ChinaAlma Mater Studiorum Univ Bologna, Dipartimento Chim Organ A Mangini, I-40136 Bologna, Italy
Wu, Li-Yuan
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Mazzanti, Andrea
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de Leon, Pablo
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机构:Univ Calif Los Angeles, Dept Chem & Biochem, Jonsson Comprehens Canc Ctr, Los Angeles, CA 90095 USA
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Tamanoi, Fuyuhiko
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Tamanoi, Fuyuhiko
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Kwon, Ohyun
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