名称:
Synthesis of the (1S,2S)- and (1R,2S)-stereoisomers of the respective E- and Z-isomers of ethyl 4-[(2-hydroxycyclohexyl)methyl]phenoxy-3-methyl-2-butenoate using yeast whole cell bioreduction of the parent ketones
摘要:
Saccharomyces,cerevisiae,strain DBM 2115, was successfully employed in the reduction of the separated Z-and E-isomers of ethyl 4-[(2-oxocyclohexyl)methyl]phenoxy-3-methyl-2-butenoates 1 and 2, in order to prepare the (1S,2S)- and (1R,2S)enantiomers of the corresponding ethyl 4-[(2-hydroxycyclohexyl)methyl]phenoxy-3-methyl-2-butenoates 3-6. The products were obtained with the required absolute configuration: (1S,2S)-3 (ee 98% yield 48%), (1R,2S)-4 lee = >99%; yield 45%), (1S,2S)-5 (ee - 98.5%; yield 47%), and (1R,2S)-6 (ee >99%; chemical yield 44%). (c) 2005 Elsevier Ltd. All rights reserved.