57707-91-2Relevant articles and documents
Diastereoselective photocycloaddition reactions of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furans governed by chiral auxiliaries and hydrogen bonding interactions
Maeda, Hajime,Koshio, Norihiro,Tachibana, Yuko,Chiyonobu, Kazuhiko,Konishi, Gen-ichi,Mizuno, Kazuhiko
, p. 7 - 17 (2017/09/12)
By using chiral auxiliaries and hydrogen bonding interactions, we have developed diastereoselective photocycloaddition of 2-naphthalenecarboxylates and 2,3-naphthalenedicarboxylates with furan derivatives. In photoreactions of (?)-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-(?)-menthyl 2,3-naphthalenedicarboxylate with 3-furanmethanol, maximum 67% d.e. is obtained. Use of solvents of low polarity, low temperatures and low furan concentration leads to increased diastereoselectivities. Variable-temperature (VT) NMR and fluorescence quenching studies indicate that hydrogen bonding interactions between the carbonyl oxygen of naphthalenecarboxylic acid esters and the OH group in 3-furanmethanol take place in both the ground and excited states. The results of computational studies show that geometries of C2 symmetric naphthalenedicarboxylate reactants are important in governing the high diastereoselectivity in the photoreactions of 2,3-naphthalenedicarboxylates.
Asymmetric Synthesis of 2-Alkyl(Aryl)-2,3-dihydro-4-pyridones by Addition of Grignard Reagents to Chiral 1-Acyl-4-methoxypyridinium Salts
Comins, Daniel L.,Goehring, R. Richard,Joseph, Sajan P.,O'Connor, Sean
, p. 2574 - 2576 (2007/10/02)
Grignard addition to a chiral 1-acyl-4-methoxypyridinium salt provides synthetically useful 2-alkyl(aryl)-2,3-dihydro-4-pyridones in high diastereomeric excess.
SYNTHESIS OF OPTICALLY ACTIVE 3-OXA-CARBACYCLIN PRECURSORS FEATURING ASYMMETRIC HORNER-EMMONS REACTION
Gais, Hans-Joachim,Schmiedl, Gerhard,Ball, Walter A.,Bund, Joerg,Hellmann, Gunther,Erdelmeier, Irene
, p. 1773 - 1774 (2007/10/02)
An enantiselective synthesis of 5 is described.Asymmetric Horner-Emmons reactions with the chiral phosphonate 6 are key steps in the synthesis of the allylic alcohols E-8 and E-11 from the ketones 5 and 9, respectively.