Neighboring group participation in Lewis acid-promoted [3 + 4] and [3 + 5] annulations. The synthesis of oxabicyclo[3.n.1]alkan-3-ones
作者:Gary A. Molander、Kimberly O. Cameron
DOI:10.1021/ja00056a002
日期:1993.2
2-(alkoxycarbon)-m-oxabicyclo[3.n.1]alkan-3-ones can be constructed by this process in which two new carbon-carbon bonds are generated. Unusually high regioncontrol is observed, and good to excellent stereochemicalcontrol can be achieved at virtually every position on the new carbocycles. Intramolecular neighboringgroupparticipation is proposed to explain the unusually high selectivities attained in the annulation
GLYCOPEPTIDE AND LIPOGLYCOPEPTIDE ANTIBIOTICS WITH IMPROVED SOLUBILITY
申请人:Rafai Far Adel
公开号:US20120149632A1
公开(公告)日:2012-06-14
The invention relates to derivatives of glycopeptide and lipoglycopeptide antibiotics possessing an altered ionization state with respect to the parent glycopeptide or lipoglycopeptide antibiotic, and having the ability to be regenerated as the parent glycopeptide or lipoglycopeptide antibiotic under physiological conditions. These compounds are useful as antibiotics for the prevention and/or the treatment of bacterial infections.
Un anion β-acyle masque dans les reactions d'acylation: Le derive lithie du dioxolanne du levulate de trimethylsilyle
作者:Jean-Louis Moreau、René Couffignal
DOI:10.1016/0022-328x(85)87462-3
日期:1985.10
An organolithium reagent derived from trimethylsilyl-4,4-ethylenedioxypentanoate reacts with mixed carboxylic-carbonic anhydrides as a homoenolateanion equivalent. Several monoethylene acetals of 1,4-diketones and the corresponding diketones are synthesized by this way.
Synthesis of 2,5-Disubstituted Pyrrolidine Alkaloids <i>via</i>
A One-Pot Cascade Using Transaminase and Reductive Aminase Biocatalysts
作者:Bruna Z. Costa、James L. Galman、Iustina Slabu、Scott P. France、Anita J. Marsaioli、Nicholas J. Turner
DOI:10.1002/cctc.201801166
日期:2018.10.23
A multi‐enzymatic cascade process involving transaminases (TAs) and reductive aminases (RedAms) to produce enantiomerically pure 2,5‐disubstituted pyrrolidine alkaloids from their respective 1,4‐diketones is reported. Several TAs were screened and the best results for diketone monoamination were obtained with an R‐selective TA from Mycobacterium chlorophenicum and with an S‐selective TA from Bacillus
The invention concerns a new process for the preparation of ketones; according to this process ketones are prepared from aldehydes and unsaturated compounds in the presence of bases using quaternary ammonium salts as catalysts.