Synthetic Studies on Spiroketal Natural Products. V. Total Synthesis of (+)-Talaromycin A and (-)-Talaromycin B.
作者:Chuzo IWATA、Naoyoshi MAEZAKI、Kohji HATTORI、Masahiro FUJITA、Yasunori MORITANI、Yoshiji TAKEMOTO、Tetsuaki TANAKA、Takeshi IMANISHI
DOI:10.1248/cpb.41.946
日期:——
The total synthesis of (+)-talaromycin A and (-)-talaromycin B was accomplished by utilizing a common intermediate (3). The spiroketal (3) was converted to the olefin (4) via thermolysis of the sulfinyl group, C1-unit elongation at the C9-position, and isomerization at the spiro center. On the other hand, 3 was isomerized to 7 at the C9-position and then converted to the olefin (5) in a similar manner to that described for (+)-talaromycin A. These intermediates (4 and 5) were transformed into (+)-talaromycin A and (-)-talaromycin B via addition reaction of trifluoroacetic acid and oxymercuration, respectively.
(+)-talaromycin A 和 (-)-talaromycin B 的全合成是利用一个共同的中间体 (3) 完成的。螺环酮(3)通过亚磺酰基的热分解、C9 位的 C1 单元伸长和螺环中心的异构化转化为烯烃(4)。另一方面,3 在 C9 位异构化为 7,然后以类似于 (+)-talaromycin A 的方式转化为烯烃 (5)。这些中间产物(4 和 5)分别通过三氟乙酸加成反应和氧巯基转化为 (+)-talaromycin A 和 (-)-talaromycin B。