(4) has been synthesized and its stereochemistry determined; cyclisation of the derived triketone (5) led to the functionalised becyclo[6.3.0]undecene (12) which embodies the B/C ring system of the fusicoccin structure, and regiospecific alkylation of (4) with 4-iodobutyl benzoate to give (13) was followed by appropriate transformations to yield the A/B fragment (16).
已经合成了对称的
环辛烷二酮(4),并确定了其立体
化学。衍生的三酮(5)的环化反应导致功能化的becyclo [6.3.0]
十一碳烯(12)体现了富西星结构的B / C环系统,以及(4)与
苯甲酸4-
碘丁酯的区域特异性烷基化,得到(13)之后进行适当的转化,以产生A / B片段(16)。