Synthesis of the C20-C32 tetrahydropyran core of the phorboxazoles and the C22 epimer via a stereodivergent Michael reaction.
Synthesis of the C20-C32 tetrahydropyran core of the phorboxazoles and the C22 epimer via a stereodivergent Michael reaction.
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通过立体发散迈克尔反应合成佛波唑类的 C20-C32 四氢吡喃核心和 C22 差向异构体。
DOI:
10.1021/ol3026523
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发表时间:
2012
期刊:
影响因子:
5.2
通讯作者:
Clarke PA
中科院分区:
文献类型:
--
作者:
Clarke PA
A stereoselective synthesis of the C20–C32 tetrahydropyran core of the phorboxazoles has been achieved in only seven steps and in a 31% overall yield. The C22 epimer was also synthesized. The key step was a silyl ether deprotection/oxy-Michael cyclization. When this step was conducted under Brønsted acid conditions, the C20–C32 core was formed with the desired 2,6-cis-stereochemistry. However, when the silyl ether deprotection/oxy-Michael cyclization was conducted under fluoride conditions buffered with acetic acid, the C22 epimer of the core was the sole product.
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DOI:
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发表时间:
2000
期刊:
影响因子:
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作者:
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通讯作者:
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影响因子:
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通讯作者:
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