Stereoselective Synthesis of Pseudopeptide Microbial Agent AI-77-B
摘要:
[GRAPHICS]An efficient and highly stereoselective synthesis of the gastroprotective natural product Al-77-B is described. The stereocenters of the hydroxy amino acid moiety were generated by an ester-derived titanium-enolate-mediated syn-aldol reaction, a Curtius rearrangement, and application of Dondoni's aldehyde homologation. Condensation with the dihydroisocoumarin fragment and subsequent deprotecting transformations furnished optically active Al-77-B.
A Stereoselective Anti-Aldol Route to (3R,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-ol: A Key Ligand for a New Generation of HIV Protease Inhibitors
作者:Arun Ghosh、Jianfeng Li、Ramu Perali
DOI:10.1055/s-2006-942547
日期:——
A stereoselectivesynthesis of (3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-ol, an important high affinity P2-ligand, in high enantiomeric excess (>99%) is reported. The synthesis features an ester-derivedtitaniumenolate based highlystereoselectiveanti-aldolreaction as the key step.
Compounds that modulate the CCR5 chemokine receptor, pharmaceutical compositions containing them, and uses therefor in the treatment of HIV and related diseases are described.