Borata-Wittig olefination reactions of ketones, carboxylic esters and amides with bis(pentafluorophenyl)borata-alkene reagents.

Borata-Wittig olefination reactions of ketones, carboxylic esters and amides with bis(pentafluorophenyl)borata-alkene reagents.
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酮、羧酸酯和酰胺与双(五氟苯基)硼酸-烯烃试剂的硼酸-维蒂希烯化反应

DOI:
10.1039/c7ob01591g
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发表时间:
2017
影响因子:
3.2
通讯作者:
G. Erker
G. Erker
中科院分区:
化学3区
文献类型:
--
作者:
T. Wang;S. Kohrt;C. G. Daniliuc;G. Kehr;G. Erker

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用LiTMP对强亲电的硼烷衍生物氨基-CH2CH2-B(C6F5)26进行α-CH去质子化,得到硼烯{[氨基-(CH2)2-CHb(C6F5)2−][Li+]}29,再与二苯甲酮或荧酮进行简单的[2+2]环加成反应,合成了相应的1,2-氧杂环芳烃11a,b,对化合物9和11进行了结构表征。化合物11a,b的热解或水解得到相应的Borata-Wittig烯化产物12a,b。各种R-CH2-CH2-B(C6F5)2硼烷(通过末端烯烃R-CHCH2与Piers‘硼烷[HB(C6F5)2]的氢硼化反应方便地生成)被类似地去质子化,得到相应的硼酸-烯烃16a-e(R:Ph-CH2-,nC4H9,Tbu,Cy,PhCH2CH2-)。它们与甲酸乙酯进行“非经典”的Borata-Wittig烯化反应,得到相应的烯醚羰基化产物,或它们的c1-伸长醛(在水解后)。硼烷[Ph-(CH2)2-CHB(C6F5)2−][Li+HTMP](16a)分别与乙酸甲酯、乙酸乙酯或γ-丁内酯反应,得到相应的“非经典”硼烷-维蒂希烯化产物25a、b和27。
The strongly electrophilic borane derivative amino–CH2CH2CH2–B(C6F5)26 was α-CH deprotonated with LiTMP to give the borata-alkene {[amino–(CH2)2–CHB(C6F5)2−][Li+]}29 which underwent facile [2 + 2] cycloaddition reactions with benzophenone or fluorenone to yield the respective 1,2-oxaboretanides 11a,b. Compounds 9 and 11 were characterized by the X-ray diffraction. Thermolysis or hydrolysis of compounds 11a,b gave the corresponding borata-Wittig olefination products 12a,b. A variety of R–CH2–CH2–B(C6F5)2 boranes (conveniently generated by hydroboration of terminal alkenes R–CHCH2 with Piers’ borane [HB(C6F5)2]) were analogously deprotonated to give the respective borata-alkenes 16a–e (R: Ph–CH2–, nC4H9, tBu, Cy, PhCH2CH2–). They underwent “non-classical” borata-Wittig olefination reactions with ethylformate to give the respective enolether carbonylation products, or their C1-elongated aldehydes (after hydrolysis). The borata-alkene [Ph–(CH2)2–CHB(C6F5)2−] [Li+HTMP] (16a) gave the respective “non-classical” borata-Wittig olefination products, the enolethers 25a,b and 27, respectively, upon treatment with methyl- or ethyl acetate or γ-butyrolactone.
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