Value of zeolites in asymmetric induction during photocyclization of pyridones, cyclohexadienones and naphthalenones

Karthikeyan Sivasubramanian, Lakshmi S. Kaanumalle, Sundararajan Uppili, V. Ramamurthy

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Two strategies, namely chiral inductor and chiral auxiliary approaches, have been examined within zeolites with the aim of achieving asymmetric induction during the photocyclization of cyclohexadienone, naphthalenone and pyridone derivatives. Within zeolites, enantioselectivity as high as 55% and diastereoselectivity as high as 88% have been obtained. The observed stereoselectivities are significant given the fact that these reactions gave very little stereoselectivities in isotropic solution media. The results obtained on the photocyclization of dienones, naphthalenones and N-alkyl pyridones within zeolites compliment our earlier investigations on the photocyclization of tropolone derivatives, the geometric isomerization of 1,2-diphenylcyclopropanes and 2,3-diphenyl-1-benzoyl cyclopropanes, and the Norrish type II reaction of α-oxoamides, phenyl adamantyl ketones, phenyl norbornyl ketones and phenyl cyclohexyl ketones. With the help of these examples, we have established the importance of zeolite and its charge compensating cations in effecting asymmetric induction in photochemical reactions. This journal is

Original languageEnglish (US)
Pages (from-to)1569-1576
Number of pages8
JournalOrganic and Biomolecular Chemistry
Volume5
Issue number10
DOIs
StatePublished - Jan 1 2007

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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