Enantioselective Synthesis of δ-Lactones with Lipase-Catalyzed Resolution and Mitsunobu Reaction
摘要:
Both enantiomers of a series of delta-lactones (e.g., delta-decalactone, delta-dodelactone, and delta-hexadecalactone) were synthesized stereoselectively by Novozym 435-catalyzed resolution. Furthermore, only (S)-enantiomers of delta-lactones were synthesized with a combination of Novozym 435-catalyzed resolution and Mitsunobu reaction.
Stereoselective Synthesis of δ-Lactones from 5-Oxoalkanals via One-Pot Sequential Acetalization, Tishchenko Reaction, and Lactonization by Cooperative Catalysis of Samarium Ion and Mercaptan
作者:Jue-Liang Hsu、Jim-Min Fang
DOI:10.1021/jo016058t
日期:2001.12.1
sequence of acetalization, Tishchenko reaction and lactonization. The deliberative use of mercaptan, by comparison with alcohol, is advantageous to facilitate the catalytic cycle. The reaction mechanism and stereochemistry are proposed and supported by some experimental evidence. Such samarium ion/mercaptan cocatalyzed reactions show the feature of remote control, which is applicable to the asymmetric synthesis
Cooperative Catalysis of Samarium Diiodide and Mercaptan in a Stereoselective One-Pot Transformation of 5-Oxopentanals into δ-Lactones
作者:Jue-Liang Hsu、Chao-Tsen Chen、Jim-Min Fang
DOI:10.1021/ol9911526
日期:1999.12.1
[GRAPHICS]We demonstrate a general method for conversion of various 5-oxopentanals to substituted delta-lactones and 1-oxa-2-decalones by the synergistic catalysis of samarium diiodide and 2-propanethiol (or disulfide), The deliberate use of mercaptan is advantageous to facilitate the catalytic cycle, This method shows high stereoselectivities, and an enantioselective procedure is feasible by using the chiral mercaptan (1R,2S)-1 phenyl-2-(N-acetamido)propanethiol as a promoter.
Enzyme assisted synthesis of enantiomerically pure δ-lactones
作者:Bernhard Haase、Manfred P. Schneider
DOI:10.1016/s0957-4166(00)80146-9
日期:1993.5
Both enantiomeric series of a wide variety of optically pure 6-alkylated delta-lactones - saturated as well as unsaturated - were prepared via an enzyme mediated route. The key reaction step is the nucleophilic ring opening of enantiomerically pure alkyl-oxiranes, accessible via the corresponding beta-hydroxythioethers which can be obtained enantiomerically pure via enzyme catalyzed kinetic resolutions.
Gadnon, Rene; Grogan, Gideon; Levitt, Melissa S., Journal of the Chemical Society. Perkin transactions I, 1994, # 18, p. 2537 - 2544
作者:Gadnon, Rene、Grogan, Gideon、Levitt, Melissa S.、Roberts, Stanley M.、Wan, Peter W. H.、Willetts, Andrew J.
DOI:——
日期:——
Enantio- and Regioselective Baeyer−Villiger Oxidations of 2- and 3-Substituted Cyclopentanones Using Engineered Bakers' Yeast