Photodimerization of alkyl 2-naphthoates with chiral auxiliaries resulted in cubane-like anti head-to-head photodimers in 93% yield and with up to 59% diastereomeric excess. After removal of the chiral auxiliaries enantiomers of cubane-like photodimer of 2-naphthalene carboxylic acid were obtained in 80% yield.
Diastereoselective photocycloaddition reactions of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furans governed by chiral auxiliaries and hydrogen bonding interactions
By using chiralauxiliaries and hydrogen bonding interactions, we have developed diastereoselective photocycloaddition of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furan derivatives. In photoreactions of (ℓ)-menthyl 2-naphthalenecarboxylate with furan and 3-furanmethanol, respective maximum 48% and 40% diastereomeric excesses (d.e.) are observed. In photoreactions of di-8-phenyl-(ℓ)-menthyl