Synthesis of a Cn–Cn+6 Building Block Common to Important Polyol,Polyene Antibiotics from a Divinylcarbinol by a Desymmetrizing Sharpless Epoxidation

Synthesis of a Cn–Cn+6 Building Block Common to Important Polyol,Polyene Antibiotics from a Divinylcarbinol by a Desymmetrizing Sharpless Epoxidation
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通过去对称 Sharpless 环氧化从二乙烯基甲醇合成重要多元醇、多烯抗生素所共有的 Cn–Cn+6 结构单元

DOI:
10.1002/ejoc.201300181
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发表时间:
2013
影响因子:
2.8
通讯作者:
R. Brückner
R. Brückner
中科院分区:
化学3区
文献类型:
--
作者:
Luc Nachbauer;R. Brückner

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以炔丙基醚15为起始原料,经15步反应,立体控制合成了对映体纯的环氧化物7 b。环氧化物7 b代表标题化合物的“东部”部分的结构单元。我们方法中的关键步骤是去对称化Sharpless环氧化(反式,顺式-16),通过非对映选择性[2,3]-Wittig重排(顺式,顺式-9)选择性处理双(烷氧基乙酸叔丁酯)11的双烯醇化物,以及立体和化学选择性碘内酯化(35)。在一锅双氧化反应中区分二羧酸37的CO2 H基团。后者需要HO_2CCH_2-O-烷基到AcOCH_2-O-烷基的新颖转化。
A stereocontrolled synthesis of the enantiomerically pure epoxide 7b from propargyl ether 15 has been realized in 15 steps. Epoxide 7b represents a building block for the “eastern” moieties of the title compounds. Key steps in our approach were a desymmetrizing Sharpless epoxidation ( anti,cis-16), the selective processing of the bis-enolate of the bis(tert-butyl alkoxyacetate) 11 through a diastereoselective [2,3]-Wittig rearrangement ( syn,syn-9), and a stereo- and chemoselective iodolactonization ( 35). The CO2H groups of dicarboxylic acid 37 were differentiated in a one-pot bis-oxidation reaction. The latter entailed the novel transformation of HO2CCH2-O-alkyl into AcOCH2-O-alkyl.
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发表时间: 2003-09-10
影响因子: 15
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期刊: Organic letters
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