期刊
SYNTHESIS-STUTTGART
卷 44, 期 3, 页码 474-488出版社
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0031-1289661
关键词
ionophore; iodoetherification; radical reduction; Lewis acid; substituted tetrahydropyrans
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
- NSERC PGS D
- FQRNT [B2]
Zincophorin C1-C9 fragment and seven tetrahydropyran analogues were prepared diastereoselectively by sequential iodoetherification and radical hydrogen-transfer reactions. Stereoselective formation of 3,7-trans or 3,7-cis rings was rationalized through minimization of allylic-1,3 strain in chair-like transition states. Subsequent hydrogen-transfer provided 7,8-anti or 7,8-syn isomers under acyclic stereocontrol or endocyclic control respectively. The latter approach relies on the formation of a [4.4.0] bicyclic complexes resulting from the chelation of the oxygen of the tetrahydropyran ring and the ester by a bidentate Lewis acid.
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