A series of 6,8-dioxo-3-thia-1,7-diazabicyclo[3.3.0]octanes and a series of 6,8-dioxo-3-thia-1,7-diazabicyclo[3.3.0]octane 2-spiro derivatives were synthesized from L-(-)-R-cysteine ethyl ester in two steps. The synthetic route involved condensation of the amino acid with an appropriate aldehyde or ketone, then a further condensation of the resultant ethyl thiazolidine-4-carboxylate with an isocyanate
New functionalized 8-hydroxyquinoline-5-sulfonic acid mesoporous silica (HQS-SBA-15) as an efficient catalyst for the synthesis of 2-thiohydantoin derivatives
Mesoporous silica SBA-15 functionalized with 8-hydroxyquinoline-5-sulfonic acid (HQS-SBA-15) was used as a new recyclable nanocatalyst for the one-pot synthesis of 2-thiohydantoin derivatives under solvent-free conditions. The catalyst exhibited excellent recyclability at least for 3 times with a high catalytic activity.
Refouvelet Bernard, Harraga Saied, Nicod Laurence, Robert Jean-Francois, +, Chem. and Pharm. Bull, 42 (1994) N 5, S 1076-1083
作者:Refouvelet Bernard, Harraga Saied, Nicod Laurence, Robert Jean-Francois, +
DOI:——
日期:——
New aspects of the formation of 2-substituted thiazolidine-4-carboxylic acids and their thiohydantoin derivatives
作者:Ahmed R. E. Mahdy、Elghareeb E. Elboray、Ragab F. Fandy、Hussien H. Abbas-Temirek、Moustafa F. Aly
DOI:10.24820/ark.5550190.p009.861
日期:——
readily with (R)-cysteine in boiling acidified methanol to give diastereomeric mixtures of the corresponding 2-(aryl substituted) thiazolidine-4-carboxylicacids. 4-Nitrobenzaldehyde under similar conditions afforded one isomer of 2-(4-nitrophenyl)thiazolidine-4-carboxylicacid, which epimerized in the NMR solvents into a diastereomeric mixture. 2-Nitrobenzaldehyde reacted with (R)-cysteine to afford 3