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Grignard Addition to Quinoxalinium Salt: Synthesis of 1, 2-Dihydro-quinoxaline and 1, 2, 3, 4-Tetrahydroquinoxaline Derivatives
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作者 Lian You ZHENG Xu BAI 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第2期165-168,共4页
Grignard additions to a quinoxalinium salt were studied. Depending on the ratio of the reagents and reaction temperature, 1, 2, 3, 4-tetrahydroquinoxaline and 1, 2-dihydroquinoxaline derivatives could be resulted sele... Grignard additions to a quinoxalinium salt were studied. Depending on the ratio of the reagents and reaction temperature, 1, 2, 3, 4-tetrahydroquinoxaline and 1, 2-dihydroquinoxaline derivatives could be resulted selectively. 展开更多
关键词 grignard addition quinoxalinium salt dihydroquinoxaline tetrahydroquinoxaline.
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Optically Active Chiral Auxiliary Benzyloxyphenylglycinol for Preparation of Oxazolidine and Its Derivatives
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作者 FUYing-huan CHENJin WUTong-hao BAIXu 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第4期476-479,共4页
To investigate the recovery of amino alcohols as chiral auxiliaries, optically active p-benzyloxyphenylglycinol and its corresponding oxazolidine of 1-naphthylcarboxaldehyde were prepared. Grignard additions to the ox... To investigate the recovery of amino alcohols as chiral auxiliaries, optically active p-benzyloxyphenylglycinol and its corresponding oxazolidine of 1-naphthylcarboxaldehyde were prepared. Grignard additions to the oxazolidine followed by electrophilic quench and acidic hydrolysis afforded an aldehyde(compound 8)(later it was reduced to an alcohol, compound 9) in an excellent enantiomeric excess and a good recovery of the chiral amino alcohol. This research provides a model study of chiral amino alcohols in solid phase asymmetric synthesis. 展开更多
关键词 Chiral auxiliary p-Benzyloxyphenylglycinol grignard addition Oxazolidine Asymmetric synthesis
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Conversion of 3-Carbethoxy-4-methyl Coumarin Derivatives into Several New Annelated Coumarin Derivatives
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作者 BAKEER HadeerMohammed 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2003年第9期1219-1223,共5页
The reaction of ethyl esters of 4-methyl-2-oxo-2H-l-benzo (naphtho)pyran-3-carboxylic acids (1) with aromatic aldehydes in the presence of piperidine yielded4-styryl-3-carboxami-dopiperidyl coumarin derivatives 4. The... The reaction of ethyl esters of 4-methyl-2-oxo-2H-l-benzo (naphtho)pyran-3-carboxylic acids (1) with aromatic aldehydes in the presence of piperidine yielded4-styryl-3-carboxami-dopiperidyl coumarin derivatives 4. The reaction of hydrazine hydrate with 1gave acetophenone hydrozone derivatives 5 and acetophenone azine derivatives 6. The reaction of 1with primary amines afforded compounds 7―9. And the treatment of la with Grignard reagents afforded3-aroyl-4-methyl coumarin derivatives 10. 展开更多
关键词 coumarin derivative CONDENSATION grignard addition
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