Total synthesis of (+)-antofine and (-)-cryptopleurine.

Total synthesis of (+)-antofine and (-)-cryptopleurine.
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DOI:
10.1002/ejoc.201300200
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发表时间:
2013-05-01
影响因子:
2.8
通讯作者:
Herndon, James W.
Herndon, James W.
中科院分区:
化学3区
文献类型:
--
作者:
Ying, Weijiang;Herndon, James W.

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以旋光活性形式合成了铃碱类生物碱类抗癌化合物安托芬和隐胸叶碱。这两种合成方法都采用光学纯α-氨基酸作为起始原料,从已知的2-乙基吡咯烷或2-乙基哌啶衍生物仅需7步,并且不含保护基团。关键步骤包括炔水化和基于铬羰基络合物的净[5+5]环加成步骤。在大多数条件下,炔水化反应伴随着β-氨基酮的外消旋反应,通过仔细控制pH值和选择金属添加剂,成功地减少了这一副反应。最后的环闭合涉及使用氨基甲酸酯(安托芬)或尿素(隐pleurine)前体的Bischler-Napieralski反应。
The tylophorine alkaloid anticancer compounds antofine and cryptopleurine have been synthesized in optically active form. Both syntheses employ optically pure α-amino acids as the starting materials, require only seven steps from known 2-ethynylpyrrolidine or 2-ethynylpiperidine derivatives, and are free of protecting groups. Key steps include an alkyne hydration and a chromium carbene complex based net [5+5]-cycloaddition step. Alkyne hydration was accompanied by racemization of the resulting β-aminoketone under most of the conditions examined, and successful minimization of this side reaction was achieved through careful pH control and choice of metal additive. Final ring closure involves a Bischler-Napieralski reaction using a carbamate (antofine) or urea (cryptopleurine) precursor.
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