Diastereoselective electrophilic substitution of γ-oxy-substituted benzyllithiums
摘要:
Reductive lithiation of diastereoisomeric mixtures of 4-aryl-5-methyl-1,3-dioxanes occurs with epimerization at the benzylic centre. Reaction of intermediate organometals with alkyl halides or CO2 afforded 2-methyl-3-substituted-3-phenylpropan-1-ols, or the corresponding lactones, with satisfactory yields and satisfactory to high diastereoselectivities. Observed diastereoselectivities strongly depend on the substitution pattern of starting materials. (C) 2002 Elsevier Science Ltd. All rights reserved.
Selective Synthesis of 4-Aryl-1,3-dioxanes from Arylalkenes and Paraformaldehyde using an Ion Exchange Resin as Catalyst; Extension to Natural Compounds
作者:Michel Delmas、Antoine Gaset
DOI:10.1055/s-1980-29243
日期:——
Drukker; Beets, Recueil des Travaux Chimiques des Pays-Bas, 1951, vol. 70, p. 29,33
作者:Drukker、Beets
DOI:——
日期:——
Prins, Chemisches Zentralblatt, 1919, p. III, 1001
作者:Prins
DOI:——
日期:——
DELMAS M.; GASET A., SYNTHESIS, 1980, NO 11, 871-872
作者:DELMAS M.、 GASET A.
DOI:——
日期:——
Sur un concept original : La catalyse triphasique et les echangeurs de cations
作者:Michel Delmas、Antoine Gaset
DOI:10.1016/0040-4039(81)80133-5
日期:1981.1
The condensation in triphase process of aqueous formaldehyde with aromatic alkenes dissolved in an organic solvent is possible in the presence of polystyrene sulfonic acid resin.