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.
中科院分区:
文献类型:
--
作者:
Ying, Weijiang;Herndon, James W.
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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