134070-87-4Relevant academic research and scientific papers
Synthesis of esters of the potent anti-bacterial trinems and analogues
Jackson, P. Mark,Roberts, Stanley M.,Davalli, Silvia,Donati, Daniele,Marchioro, Carla,Perboni, Alcide,Proviera, Stefano,Rossi, Tino
, p. 2029 - 2039 (2007/10/03)
Coupling the silyl enol ether 5 and the β-lactam 9 (R = Me3Si) affords the ketones 13a-d. Compounds 13a, 13c and 13d are converted into the tricyclic lactams 16-20, 23-25. (Chemoenzymatic synthesis of optically pure silyl enol ether 5 gave access to homochiral lactams 23-25.) In addition the ketoazetidinones 13 are protected as the 1,3-oxazanes 30. A hydroxyethyl moiety is introduced into these oxazanes at C-11 with the desired stereochemistry using the Bouffard methodology, to afford the alcohols 32. Formation of the corresponding nitrobenzyl carbonate, deprotection and oxidation furnishes the ketones 35a and 35b, which are subsequently converted into the trinems 41a and 41b, respectively.
A General Method for the Separation of Enantiomeric trans-2-Substituted Cyclohexanols
Hoenig, Helmut,Seufer-Wasserthal, Peter
, p. 1137 - 1140 (2007/10/02)
An number of different racemic, trans-2-substituted cyclohexanols has been prepared in high optical purity by optical resolution of the respective 2'-substituted cyclohexyl butanoates with the aid of commercially available lipases.
