Aldolase-Catalyzed Synthesis of Conformationally Constrained Iminocyclitols: Preparation of Polyhydroxylated Benzopyrrolizidines and Cyclohexapyrrolizidines
摘要:
A straightforward chemo-enzymatic synthesis of new polyhydroxylated benzopyrrolizidines and cyclohexapyrrolizidines is developed. The two-step strategy consists of L-fuculose-1-phosphate aldolase variant F131A-catalyzed aldol addition of dihydroxyacetone phosphate to rac-N-benzyl-oxycarbonyfindoline-2-carbaldehyde as well as (2S*,3aS*,7aS*)- and (2S*,3aR*,7aR*)-N-benzyloxycarbonyloctahydroindole-2-carbaldehydes and a subsequent one-step catalytic deprotection-reductive amination.
SmI<sub>2</sub>-Mediated Couplings of α-Amino Acid Derivatives. Formal Synthesis of (−)-Pumiliotoxin 251D and (±)-Epiquinamide
作者:Vagner D. Pinho、David J. Procter、Antonio C. B. Burtoloso
DOI:10.1021/ol400903n
日期:2013.5.17
by samarium diiodide, is described. The method constitutes a powerful tool to construct indolizidine, quinolizidine, and piperidine systems in a straightforward two-step fashion. The formalsynthesis of (−)-pumiliotoxin 251D and (±)-epiquinamide is achieved after two or three steps from these amino acid derivatives.
The present invention involves tricyclic-fused 6-member ring oxazolidinones ##STR1## and tricyclic-fused 5-member ring oxazolidinones ##STR2## which are useful as antibacterial agents.