A two step synthesis of 3-deoxy-d- or l-glycono-1,4-lactones and 2-0-alkyl-3-deoxy-d-glycono-1,4-lactones from d- or l-glyconolactones
摘要:
Treatment of unprotected D-or L-glyconolactones with sodium hydride and alkyl halides, in dimethylsulfoxide, led to the corresponding 2-O-alkyl-3-deoxy-2-enono-1,4-lactones. Hydrogenolysis of 2-O-benzyl derivatives by catalytic hydrogen transfer with palladium on charcoal and cyclohexene as hydrogen donor gave 3-deoxy-hex- or pent-2-enono-1,4-lactones in the enolic forms. Reduction of 2-O-benzyl-enonolactones with ammonium formate as hydrogen donor afforded 3-deoxy-D- or L-glycono-1,4-lactones when 2-O-alkyl ethers gave the corresponding ethers. (C) 1997 Elsevier Science Ltd.
have been the subject of renewed interest from the scientific community thanks to their antiviral activity. The COVID-19 global pandemic, indeed, spread light on the antiviral drug Remdesivir, an adenine C-nucleoside analogue. This new attention of the medical community on Remdesivir prompts the medicinal chemists to investigate once again C-nucleosides. One of the essential building blocks to synthetize
Synthetic approaches to either homochiral or achiral derivatives of 3-hydroxy-2(5H)-furanone (isotetronic acid)
作者:Joaquim Bigorra、Josep Font、Cristina Ochoa de Echagüen、Rosa M. Ortuño
DOI:10.1016/s0040-4020(01)81841-x
日期:1993.7
Several title compounds were synthesized according to new methods based either on the use of D-ribonolactone as a chiral precursor or on the cyclization of 2,4-dioxopentanoic acid as a suitable achiral precursor. Base-induced elimination and subsequent acid-promoted ring contraction is an efficient protocol for the preparation of isotetronic acids from 2-O-alkyl-3,4-O-benzylidene-D-ribono-1,5-lactone derivatives
Treatment of unprotected D-or L-glyconolactones with sodium hydride and alkyl halides, in dimethylsulfoxide, led to the corresponding 2-O-alkyl-3-deoxy-2-enono-1,4-lactones. Hydrogenolysis of 2-O-benzyl derivatives by catalytic hydrogen transfer with palladium on charcoal and cyclohexene as hydrogen donor gave 3-deoxy-hex- or pent-2-enono-1,4-lactones in the enolic forms. Reduction of 2-O-benzyl-enonolactones with ammonium formate as hydrogen donor afforded 3-deoxy-D- or L-glycono-1,4-lactones when 2-O-alkyl ethers gave the corresponding ethers. (C) 1997 Elsevier Science Ltd.