A Nucleophilic Activation of Carboxylic Acids by Proline: Oxa-Michael Addition to Methyl Vinyl Ketone under Solvent-Free Conditions
作者:Srinivasan Easwar、Ajit Jha、Heena Inani
DOI:10.1055/s-0036-1588172
日期:2017.7
chromatographic purification, imparting a green quotient to the protocol. A heterodimeric non-covalent interaction between the amino acid and the carboxylic acid appears to be the most plausible mechanistic interpretation for the nucleophilicactivation; additionally, the possible activation of the Michael acceptor by iminium ion formation presents an interesting case of proline acting as a bifunctional catalyst
Base-catalyzed .beta.-elimination reactions in aqueous solution. IV. Elimination from 4-(4-substituted benzoyloxy)-2-butanones
作者:Richard C. Cavestri、Leo R. Fedor
DOI:10.1021/ja00718a023
日期:1970.7
Towards the Synthesis of Inosine Building Blocks for the Preparation of Oligonucleotides with Hydrophobic Alkyl Chains Between the Nucleotide Units
作者:Karl Köstler、Helmut Rosemeyer
DOI:10.3390/molecules14114326
日期:——
research reported in this manuscript was the synthesis of novel phosphoramidite buildingblocks for the preparation of lipophilic oligonucleotides. Reaction of inosine (4) with 4-oxopentyl-4-methylbenzoate (2c) in the presence of triethyl orthoformate and 4M HCl in 1,4-dioxane gave a diastereoisomeric mixture of the ketals 5. Subsequent 4,4'-dimethoxytritylation at the 5'-hydroxyl afforded (R)-6 +