Synthesis of 1′,2′-cis-Nucleoside Analogues: Evidence of Stereoelectronic Control for SN2 Reactions at the Anomeric Center of Furanosides
摘要:
We are reporting a highly diastereoselective route to 1 ',2 '-cis-nucleoside analogues in the D-ribo, D-lyxo, D-xylo, and D-arabinoside series. Five-membered ring lactols undergo highly selective N-glycosidation reactions in the presence of dimethylboron bromide with different silylated nucleobases. Stereoelectronic control plays a crucial role for the observed induction, and the products are proposed to be formed through S(N)2 "exploded" transition states. This approach shows great potential considering its simplicity and selectivity for the synthesis of nucleoside analogues, an important class of molecules in medicinal chemistry.
Oxidation of alkyl trimethylsilyl ketene acetals with lead(IV) carboxylates
作者:George M. Rubottom、John M. Gruber、Roberto Marrero、Henrik D. Juve、Chong Wan Kim
DOI:10.1021/jo00173a031
日期:1983.12
RUBOTTOM, G. M.;GRUBER, J. M.;MARRERO, R.;JUVE, H. D. ,, JR;KIM, SHONG, W+, J. ORG. CHEM., 1983, 48, N 25, 4940-4944
作者:RUBOTTOM, G. M.、GRUBER, J. M.、MARRERO, R.、JUVE, H. D. ,, JR、KIM, SHONG, W+
DOI:——
日期:——
[DE] VERFAHREN ZUR HERSTELLUNG VON (R)- ODER (S)-HYDROXY- gamma -BUTYROLACTON<br/>[EN] METHOD FOR PRODUCING (R) OR (S)-HYDROXY- gamma -BUTYROLACTONE<br/>[FR] PROCEDE DE FABRICATION DE (R)- OU (S)-HYDROXY- gamma -BUTYROLACTONE
申请人:LONZA AG
公开号:WO2001018231A2
公开(公告)日:2001-03-15
Beschrieben wird ein neues Verfahren zur Herstellung von (R)- und/oder (S)-2-Hydroxy-η-butyrolactonen der Formeln (I) und (II) und/oder von (S)- und/oder (R)-2-Acyloxy-η-butyrolactonen der allgemeinen Formeln (III) und (IV), worin ein racemisches 2-Acyloxy-η-butyrolacton der allgemeinen Formel (V) mittels Hydrolasen in die Verbindungen der Formeln (I) oder (II) umgesetzt wird, wobei die Verbindungen der Formeln (III) oder (IV) anfallen.