Segment A were further coupled by Yamaguchi esterification method. Final transformation of the furan ring into the maleic anhydride and removal of the protecting groups completed the total synthesis of (+)-tautomycin.
互变霉素分子被分成3个逆合成段,A,B和C,每个都以光学活性形式合成。在BF 3 ·OEt 2存在下,
环氧化物和砜碳负离子之间实现了链段B和C之间的首次偶联。通过山口酯化法将该产物(B / C段)和A段进一步偶联。
呋喃环最终转化为
马来酸酐并除去保护基团完成了(+)-
互变霉素的全部合成。