Chiral photochemistry in a confined space: torquoselective photoelectrocyclization of pyridones within an achiral hydrophobic capsule
Chiral induction during the photoelectrocyclization of pyridones included within octa acid (OA) capsule has been established. Chiral induction is brought about by a chiral auxiliary appended to the reactive pyridone moiety. Importantly, the same chiral auxiliary while ineffective in acetonitrile sol...
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Veröffentlicht in: | Tetrahedron 2009-08, Vol.65 (35), p.7277-7288 |
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description | Chiral induction during the photoelectrocyclization of pyridones included within octa acid (OA) capsule has been established. Chiral induction is brought about by a chiral auxiliary appended to the reactive pyridone moiety. Importantly, the same chiral auxiliary while ineffective in acetonitrile solution is found to be effective within the confined space of OA capsule. The diastereomeric excess of 92% obtained here is comparable only to that in solid state. OA capsule, we believe, provides restriction to the rotational motions of the reactant pyridone and chiral auxiliary and thus places the chiral auxiliary in a selective conformation with respect to the reactive pyridone part. A correlation between the position of the methyl group on the pyridone ring and diastereoselectivity was noted. Structures of the host–guest complexes were examined by
1H NMR and the data were used to obtain preliminary information concerning the mechanism of chiral induction within the confined spaces of OA capsule.
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doi_str_mv | 10.1016/j.tet.2009.01.110 |
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1H NMR and the data were used to obtain preliminary information concerning the mechanism of chiral induction within the confined spaces of OA capsule.
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1H NMR and the data were used to obtain preliminary information concerning the mechanism of chiral induction within the confined spaces of OA capsule.
[Display omitted]</description><subject>Chiral photochemistry</subject><subject>Confined space</subject><subject>Electrocyclization</subject><subject>Host–guest</subject><subject>Pyridones</subject><subject>Supramolecular assemblies</subject><issn>0040-4020</issn><issn>1464-5416</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNp9kU-L1TAUxYMozpvRD-BGsnTTmtsk_aMgyENHYcCNrkOa3to8-ppOkr6h7v3e5tlx0I0QCCHnnHs5P0JeAMuBQfn6kEeMecFYkzPIAdgjsgNRikwKKB-THWOCZYIV7IJchnBgjAEU_Cm5KIDxqqnkjvzcD9brkc6Di84MeLQh-pXaiWpq3NTbCTsaZm3wDY3O3y4u4Igm2hNunt8v78xqRvtDR-sm6no6r952bsJA72wczmnpmG3UsHbeJW9rDTV6DsuIz8iTXo8Bn9_fV-Tbxw9f95-ymy_Xn_fvbzIjoYqZrmrTNQ2KshKC1UULCFyiEEJ2vDW6rwXnfQ1FwatSVGXZdCKVowW0upKy4Ffk3ZY7L-0RO4NTTBup2duj9qty2qp_fyY7qO_upIqmFLWAFPDqPsC72wVDVKkwg-OoJ3RLUFBzKSVw0SQpbFLjXQge-4cxwNQZnzqohE-d8SkGKuFLnpd_7_fg-MMrCd5uAkwtnSx6FYzFyWBnfeKgOmf_E_8L5JevIg</recordid><startdate>20090829</startdate><enddate>20090829</enddate><creator>Sundaresan, Arun Kumar</creator><creator>Gibb, Corinne L.D.</creator><creator>Gibb, Bruce C.</creator><creator>Ramamurthy, V.</creator><general>Elsevier Ltd</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20090829</creationdate><title>Chiral photochemistry in a confined space: torquoselective photoelectrocyclization of pyridones within an achiral hydrophobic capsule</title><author>Sundaresan, Arun Kumar ; Gibb, Corinne L.D. ; Gibb, Bruce C. ; Ramamurthy, V.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c517t-a78cd99e46744082b1e135e4445d3bcaf8433f812237647669d4009a41ba75523</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Chiral photochemistry</topic><topic>Confined space</topic><topic>Electrocyclization</topic><topic>Host–guest</topic><topic>Pyridones</topic><topic>Supramolecular assemblies</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sundaresan, Arun Kumar</creatorcontrib><creatorcontrib>Gibb, Corinne L.D.</creatorcontrib><creatorcontrib>Gibb, Bruce C.</creatorcontrib><creatorcontrib>Ramamurthy, V.</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Tetrahedron</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sundaresan, Arun Kumar</au><au>Gibb, Corinne L.D.</au><au>Gibb, Bruce C.</au><au>Ramamurthy, V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Chiral photochemistry in a confined space: torquoselective photoelectrocyclization of pyridones within an achiral hydrophobic capsule</atitle><jtitle>Tetrahedron</jtitle><addtitle>Tetrahedron</addtitle><date>2009-08-29</date><risdate>2009</risdate><volume>65</volume><issue>35</issue><spage>7277</spage><epage>7288</epage><pages>7277-7288</pages><issn>0040-4020</issn><eissn>1464-5416</eissn><abstract>Chiral induction during the photoelectrocyclization of pyridones included within octa acid (OA) capsule has been established. Chiral induction is brought about by a chiral auxiliary appended to the reactive pyridone moiety. Importantly, the same chiral auxiliary while ineffective in acetonitrile solution is found to be effective within the confined space of OA capsule. The diastereomeric excess of 92% obtained here is comparable only to that in solid state. OA capsule, we believe, provides restriction to the rotational motions of the reactant pyridone and chiral auxiliary and thus places the chiral auxiliary in a selective conformation with respect to the reactive pyridone part. A correlation between the position of the methyl group on the pyridone ring and diastereoselectivity was noted. Structures of the host–guest complexes were examined by
1H NMR and the data were used to obtain preliminary information concerning the mechanism of chiral induction within the confined spaces of OA capsule.
[Display omitted]</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>21037975</pmid><doi>10.1016/j.tet.2009.01.110</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
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source | Elsevier ScienceDirect Journals |
subjects | Chiral photochemistry Confined space Electrocyclization Host–guest Pyridones Supramolecular assemblies |
title | Chiral photochemistry in a confined space: torquoselective photoelectrocyclization of pyridones within an achiral hydrophobic capsule |
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