| 摘要 |
<p>Thiazole derivatives of formula II, in which R1 means C1-C4 alkyl, R2 means any protective group that can be chelated, R3 means hydrogen or C1-C4 alkyl, Y means CO2R4, CHO, CH-CH2 or CH2R5, whereby R4 stands for C1-C4 alkyl and an optionally substituted benzyl group, R5 stands for halogen, hydroxy, p-toluenesulfonate and -OSO2B and B stands for C1-C4 alkyl or C1-C4 perfluoroalkyl, can be produced free of diastereomers and are suitable for the production of epothilone A and epothilone B and derivatives thereof.</p> |
