New chiral synthons for efficient introduction of bispropionates via stereospecific oxonia-cope rearrangements

New chiral synthons for efficient introduction of bispropionates via stereospecific oxonia-cope rearrangements
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DOI:
10.1021/ja061082f
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发表时间:
2006-04-12
影响因子:
15
通讯作者:
McDonald, FE
McDonald, FE
中科院分区:
化学1区
文献类型:
--
作者:
Chen, YH;McDonald, FE

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化合物1和2是合成双丙酸酯的新型手性配体,在刘易斯酸催化下,双丙酸酯单元与包括α-手性醛在内的多种醛发生立体专一性转移.因此,在温和的条件下,非对映异构体1得到具有反立体化学的E-烯烃双丙酸酯3,而非对映异构体2得到具有完全立体专一性的Z-烯烃产物4。该方法的有效性在以2和(R)-2-甲基戊醛开始的invictolide的短合成中得到证实。
Compounds1and2are novel synthons for bispropionate synthesis, undergoing stereospecific Lewis acid-catalyzed transfer of the bispropionate unit with a variety of aldehydes, including α-chiral aldehydes. Thus1leads to theE-alkene bispropionate3withanti-stereochemistry, whereas diastereomer2gives theZ-alkene product4, under mild conditions and with complete stereospecificity. The efficacy of this methodology is demonstrated in a short synthesis of invictolide beginning with2and (R)-2-methylpentanal.