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
中科院分区:
文献类型:
--
作者:
T. Wang;S. Kohrt;C. G. Daniliuc;G. Kehr;G. Erker
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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DOI:
10.1021/jo201280x
发表时间:
2011-08
期刊:
The Journal of organic chemistry
影响因子:
--
作者:
T. Tomioka;Rambabu Sankranti;Trey G. Vaughan;Toshihide Maejima;Takayoshi Yanase
通讯作者:
T. Tomioka;Rambabu Sankranti;Trey G. Vaughan;Toshihide Maejima;Takayoshi Yanase
DOI:
10.1039/p19920000747
发表时间:
1992
期刊:
Journal of The Chemical Society-perkin Transactions 1
影响因子:
--
作者:
A. Pelter;Keith Smith;Kevin D. Jones
通讯作者:
Kevin D. Jones
影响因子:
1.8
作者:
A. Pelter;Keith Smith;S. Elgendy;M. Rowlands
通讯作者:
M. Rowlands
DOI:
10.1055/s-1989-27446
发表时间:
1989
期刊:
Synthesis
影响因子:
--
作者:
R. Aitken;G. L. Thom
通讯作者:
G. L. Thom
影响因子:
--
作者:
R. Littger;H. Nöth;M. Thomann;M. Wagner
通讯作者:
M. Wagner