Hydroxylation of and halogen addition to the carbon carbon double bond of ()-2-hydroxy-3-enoic acids
作者:Hongtao Yu、Helmut Simon
DOI:10.1016/s0040-4020(01)86507-8
日期:1991.11
Various ()-2-hydroxy-3-enoic acids and their derivatives have been subjected to epoxidations with peracids, dihydroxylations with osmiumtetroxide or methylrhenium trioxide. Depending on the derivatives and reagents applied, the diastereomeric excesses (de) achieved were in the range of 8–80%. Based on the different addition mechanisms of osmiumtetroxide and methylrhenium trioxide, all four possible
L-Erythruronic Acid Derivatives as Building Blocks for Nucleoside Analogs. Synthesis of 4?-C-Aryl-D-ribonucleosides
作者:Dieter Beer、Roger Meuwly、Andrea Vasella
DOI:10.1002/hlca.19820650828
日期:1982.12.15
hydride shifts during formation of 10 and 11. Reaction of 6 with methcoxymethoxyphenyllithium gave the lactones 18 and 19. The L-lyxo isomer 19 was transformed in high yields into the D-ribo lactone 18. Compound 10 was transformed into the adenosine analoge 24 by reduction with Diisobutylaluminium hydride, hydrolysis, acetylation and nucleoside synthesis according to Vorbrüggen (Scheme 3). Its structure was