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
Hauptverfasser: Sundaresan, Arun Kumar, Gibb, Corinne L.D., Gibb, Bruce C., Ramamurthy, V.
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container_end_page 7288
container_issue 35
container_start_page 7277
container_title Tetrahedron
container_volume 65
creator Sundaresan, Arun Kumar
Gibb, Corinne L.D.
Gibb, Bruce C.
Ramamurthy, V.
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. [Display omitted]
doi_str_mv 10.1016/j.tet.2009.01.110
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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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