Total Synthesis of (6
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)‐Azaspiracid‐3 Reveals Non‐Identity with the Natural Product
作者:Nathaniel T. Kenton、Daniel Adu‐Ampratwum、Antony A. Okumu、Zhigao Zhang、Yong Chen、Son Nguyen、Jianyan Xu、Yue Ding、Pearse McCarron、Jane Kilcoyne、Frode Rise、Alistair L. Wilkins、Christopher O. Miles、Craig J. Forsyth
DOI:10.1002/anie.201711006
日期:2018.1.15
A convergent and stereoselective total synthesis of the previously assigned structure of azaspiracid‐3 has been achieved by a late‐stage Nozaki–Hiyama–Kishi coupling to form the C21−C22 bond with the C20 configuration unambiguously established from l‐(+)‐tartaric acid. Postcoupling steps involved oxidation to an ynone, modified Stryker reduction of the alkyne, global deprotection, and oxidation of
通过后期的Nozaki–Hiyama–Kishi偶联形成C21–C22键,并由l -(+)-酒石酸明确建立了C20构型,从而实现了先前分配的azaspiracid-3结构的会聚和立体选择性全合成。酸。后偶联步骤包括氧化成乙炔,改进的炔烃的Stryker还原,整体脱保护以及将所得的C1伯醇氧化成羧酸。合成产物通过质谱与天然存在的氮杂螺菌灵-3相匹配,但在色谱和光谱上均存在差异。