TFA对3-乙酰氧基氨基喹唑啉酮2和10与丙烯酸甲酯和丙烯酸叔丁酯竞争反应的影响被解释为支持过渡态几何形状的变化,其中(Q)C O /(酯)C O重叠7b被(Q)C N + H /(酯)C O重叠7c取代(Q =喹唑啉酮)。即使不存在TFA,使用2-三氟甲基取代的3-乙酰氧基氨基喹唑啉酮20和21进行丙烯酸甲酯或丙烯酸叔丁酯的氮杂环化反应也具有(Q)C N /(酯)C O重叠22。
Aziridination of alkenes using 2-substituted-3-acetoxyamino-quinazolin-4(3H )-ones: changes in transition state geometry resulting from addition of trifluoroacetic acid or by an electron-withdrawing 2-substituent
作者:Robert S. Atkinson、Sabri Ulukanli
DOI:10.1039/a809703h
日期:——
are interpreted as supporting a change in transition state geometry from one where (Q)CO/(ester)CO overlap 7b is replaced by (Q)CN+H/(ester)CO overlap 7c (Q = quinazolinone). Aziridinations of methyl or tert-butyl acrylate using 2-trifluoromethyl-substituted 3-acetoxyaminoquinazolinones 20 and 21 take place with (Q)CN/(ester)CO overlap 22 even in the absence of TFA.
TFA对3-乙酰氧基氨基喹唑啉酮2和10与丙烯酸甲酯和丙烯酸叔丁酯竞争反应的影响被解释为支持过渡态几何形状的变化,其中(Q)C O /(酯)C O重叠7b被(Q)C N + H /(酯)C O重叠7c取代(Q =喹唑啉酮)。即使不存在TFA,使用2-三氟甲基取代的3-乙酰氧基氨基喹唑啉酮20和21进行丙烯酸甲酯或丙烯酸叔丁酯的氮杂环化反应也具有(Q)C N /(酯)C O重叠22。
Aziridination of alkenes using 3-acetoxyamino-2-trifluoromethylquinazolin-4(3H)-one
作者:Robert S. Atkinson、Michael P. Coogan、Clive L. Cornell
DOI:10.1039/p19960000157
日期:——
Oxidation of 3-amino-2-trifluoromethylquinazolin-4(3H)-one 6 with lead tetraacetate in dichloromethane gives the title 3-acetoxyamino derivative 7 which is isolable at room temperature and considerably more stable than the corresponding 2-alkyl substituted analogues. Compound 7 aziridinates alkenes in yields which are consistently higher than those from the 2-alkyl substituted analogues. Aziridinations