Chiral Lewis Acid Catalyzed Asymmetric Cycloadditions of Carbonyl Ylides Generated from Diazoimide Derivatives and Their Synthetic Applications to Indolizidine Alkaloids
Highly enantioselective 1,3-dipolar cycloaddition reactions, catalyzed by chiral Lewis acids, between several 3-(2-alkenoyl)-2-oxazolidinones and carbonyl ylides that were generated from N-diazoacetyl lactams are described. Reactions of N-diazoacetyl lactams that possess 5-, 6-, and 7-membered rings...
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Veröffentlicht in: | Journal of organic chemistry 2013-11, Vol.78 (21), p.10840-10852 |
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container_title | Journal of organic chemistry |
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creator | Suga, Hiroyuki Hashimoto, Yuta Yasumura, Shingo Takezawa, Ryota Itoh, Kennosuke Kakehi, Akikazu |
description | Highly enantioselective 1,3-dipolar cycloaddition reactions, catalyzed by chiral Lewis acids, between several 3-(2-alkenoyl)-2-oxazolidinones and carbonyl ylides that were generated from N-diazoacetyl lactams are described. Reactions of N-diazoacetyl lactams that possess 5-, 6-, and 7-membered rings were transformed to the corresponding epoxy-bridged indolizidines, quinolizidines, and 1-azabicyclo[5.4.0]undecanes with good to high enantioselectivities. Regio- and stereoselective ring-opening of the epoxy-bridged indolizidine cycloadduct gave the corresponding alcohol as a single diastereomer. The sequence of asymmetric cycloaddition followed by ring-opening was applied to the syntheses of several chiral indolizidine derivatives, including (+)-tashiromine. |
doi_str_mv | 10.1021/jo401837d |
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Org. Chem</addtitle><date>2013-11-01</date><risdate>2013</risdate><volume>78</volume><issue>21</issue><spage>10840</spage><epage>10852</epage><pages>10840-10852</pages><issn>0022-3263</issn><eissn>1520-6904</eissn><abstract>Highly enantioselective 1,3-dipolar cycloaddition reactions, catalyzed by chiral Lewis acids, between several 3-(2-alkenoyl)-2-oxazolidinones and carbonyl ylides that were generated from N-diazoacetyl lactams are described. Reactions of N-diazoacetyl lactams that possess 5-, 6-, and 7-membered rings were transformed to the corresponding epoxy-bridged indolizidines, quinolizidines, and 1-azabicyclo[5.4.0]undecanes with good to high enantioselectivities. Regio- and stereoselective ring-opening of the epoxy-bridged indolizidine cycloadduct gave the corresponding alcohol as a single diastereomer. The sequence of asymmetric cycloaddition followed by ring-opening was applied to the syntheses of several chiral indolizidine derivatives, including (+)-tashiromine.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>24099422</pmid><doi>10.1021/jo401837d</doi><tpages>13</tpages></addata></record> |
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title | Chiral Lewis Acid Catalyzed Asymmetric Cycloadditions of Carbonyl Ylides Generated from Diazoimide Derivatives and Their Synthetic Applications to Indolizidine Alkaloids |
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