| 摘要 |
The present invention relates to a method of preparing a compound of Formula II-a' or Formula II-b', wherein R' represents hydrogen or a linear, branched and/or cyclic alkyl or alkenyl group having 1 to 10 carbon atoms; R II represents a linear, branched and/or cyclic alkyl or alkenyl group having 1 to 10 carbon atoms; R III represents hydrogen or a linear, branched and/or cyclic alkyl or alkenyl group having 1 to 10 carbon atoms or a linear, branched and/or cyclic alkoxy group having 1 to 10 carbon atoms; R IV represents hydrogen or a linear, branched and/or cyclic alkyl group having 1 to 10 carbon atoms or an optionally substituted aryl or alkylaryl group having 6 to 40 carbon atom or acetyl or silyl or a protective group; and R V represents hydrogen or a methyl group; wherein R I and R" are different from each other. |
