Concise synthesis of the Taxol side chain and demethoxy-4-epi-cytoxazone via oxazoline formation through intramolecular benzylic substitution of a bis-trichloroacetimidate
作者:Yoshitaka Matsushima、Mina Orita
DOI:10.1016/j.tetlet.2021.153095
日期:2021.6
side chain via the corresponding oxazoline intermediate was developed. The oxazoline ring is formed via an SN1 mechanism to ensure that the trans-oxazoline stereochemistry is retained. This process was induced by intramolecular benzylic substitution of a 1,2-bis-trichloroacetimidate, which was obtained from a known, enantiomerically pure diol. Demethoxy-4-epi-cytoxazone was also obtained from the intermediary
开发了一种通过相应的恶唑啉中间体合成紫杉醇侧链的简洁有效的方法。恶唑啉环通过S N 1 机制形成,以确保保留反式恶唑啉立体化学。该过程是由 1,2-双-三氯乙亚氨酸酯的分子内苄基取代诱导的,1,2-双-三氯乙酰亚胺酯是从已知的对映体纯二醇中获得的。脱甲氧基-4- epi - cytoxazone 也从中间体反式-恶唑啉3b 中获得。