Palladium catalyzed stereospecific allylic substitution of 5-acetoxy-2(5H)-furanone and 6-acetoxy-2H-pyran-3(6H)-one by alcohols
作者:Hanneke van der Deen、Arjan van Oeveren、Richard M. Kellogg、Ben L. Feringa
DOI:10.1016/s0040-4039(98)02683-5
日期:1999.2
Enantiomerically pure 5-acetoxy-2(5H)-furanone and 6-acetoxy-2H-pyran-3(6H)-one are converted into 5-alkoxy-2(5H)-furanones and 6-alkoxy-2H-pyran-3(6H)-ones by a palladium catalyzed allylic substitution. The reactions proceed with nearly complete retention of configuration, resulting in products with ee's of 95%.
Enzymatic Synthesis of Optically Active Lactones<i>via</i>Asymmetric Bioreduction using Ene-Reductases from the Old Yellow Enzyme Family
作者:Nikolaus G. Turrini、Mélanie Hall、Kurt Faber
DOI:10.1002/adsc.201500094
日期:2015.5.26
activities and stereoselectivities and lactone products were obtained in moderate to excellent yields; importantly, enzyme‐based stereocontrol allowed access to both enantiomers in up to >99% ee. Chiral recognition of a distant γ‐center led to kinetic resolution with remarkable enantioselectivities (E values up to 49). An unprecedented case of dynamic kinetic resolution was observed with 3‐methyl‐5‐phenylfuran‐2(5H)‐one