Asymmetric synthesis of D- and L-2-deoxy-4-thioriboscs
摘要:
Both D- and L-enantiomers of 2-deoxy-4-thioribose derivatives 12 and 17 were prepared stereospecifically in 12 steps from 1,3-propanediol. The key intermediary 2,3-epoxy alcohols, 8 and 15 were obtained with high enantiomeric excess by the Sharpless asymmetric epoxidation using (+)-L-diethyl tartrate and (-)-D-diethyl tartrate.
Asymmetric synthesis of D- and L-2-deoxy-4-thioriboscs
摘要:
Both D- and L-enantiomers of 2-deoxy-4-thioribose derivatives 12 and 17 were prepared stereospecifically in 12 steps from 1,3-propanediol. The key intermediary 2,3-epoxy alcohols, 8 and 15 were obtained with high enantiomeric excess by the Sharpless asymmetric epoxidation using (+)-L-diethyl tartrate and (-)-D-diethyl tartrate.
Synthesis of acetal-αḡlucosides. A stereoselective entry into a new class of compounds
作者:Lutz F. Tietze、Roland Fischer、Hans J. Guder、Ada Goerlach、Manfred Neumann、Thomas Krach
DOI:10.1016/0008-6215(87)80129-5
日期:1987.7
Abstract Acetal-glycosides are a new class of compounds, which became of special interest as enzyme inhibitors and cytostatics for the treatment of cancer. In a highly stereoselective glucosidation, acetyl-protected acetal-α-glucosides such as methoxymethyl 2,3,4,6-tetra- O -acetal-α- d -glucopyranoside ( 5a ) were obtained in 60–80% yield by treatment of 2,3,4,6-tetra- O -acetyl-1- O -trimethylsilyl-α-
Stereoselective synthesis of (1-alkoxyalkyl) α- and β-d-glucopyranosiduronates (acetal-glucopyranosiduronates): A new approach to specific cytostatics for the treatment of cancer
作者:Lutz F. Tietze、Rainer Seele、Barbara Leiting、Thomas Krach
DOI:10.1016/0008-6215(88)80082-x
日期:1988.9
(1-alkoxyalkyl) α- and β-glycosides (acetal-glucopyranosiduronates) with retention of configuration at C-1 in yields of 41–91%. Instead of the dialkyl acetals, the corresponding aldehydes and alkyl trimethylsilyl ether can be used. Deacetylation gave the corresponding methyl (acetal-β- and -α- d -glucopyranosid)uronates in good yield. De-esterification of methyl [(1R)-1-methoxybutyl β- d -glucopyranosid]uronate
Optically active cyclic xanthate was prepared by the reaction of an epoxy alcohol with NaH and CS2, and was found to be a useful intermediate for synthesis of 4-thio-2-deoxyribose and 4â²-thio-2â²-deoxyribonucleoside.
通过环氧醇与 NaH 和 CS2 的反应制备了具有光学活性的环黄原酸盐,并发现它是合成 4-硫代-2-脱氧核糖和 4â²-硫代-2â²-脱氧核苷的有用中间体。
Synthesis and Antiviral Evaluation of 1'-Branched-5'-Norcarbocyclic Adenosine Phosphonic Acid Analogues
作者:Chang-Hyun Oh、Kyung-Ho Yoo、Joon-Hee Hong
DOI:10.5012/bkcs.2010.31.9.2473
日期:2010.9.20
Novel 1'-methyl-5'-norcarbocyclic adenosine phosphonic acid analogues were synthesized using an acyclic stereoselective route from commercially available 3,3-diethoxy-propan-1-ol 4. The synthesized nucleoside phosphonate 19 and phosphonic acid 21 were subjected to antiviral screening against various viruses.
The title compound, the key intermediate for a total synthesis of bicyclomycin, was synthesized from N,N′-diacetyl anhydroglycine through twelve steps. The three-carbon branch for the construction of the bicyclic skeleton was introduced to the 2,5-piperazinedione ring as an alkylidene substituent, and then the olefinic function was converted into a diol function. The formation of bicyclic ring was achieved by treatment with N-bromosuccinimide followed by the intramoleculer substitution of the primary hydroxyl group in the side chain, and finally the secondary hydroxyl group was converted to the methylene function by an improved Peterson reaction.