A colorless monoclinic crystal of dichloro-benzoxazine was obtained and examined by single crystal X-ray diffraction analysis. At the same time, molecular modeling analysis of nine benzoxazine compounds with different...A colorless monoclinic crystal of dichloro-benzoxazine was obtained and examined by single crystal X-ray diffraction analysis. At the same time, molecular modeling analysis of nine benzoxazine compounds with different substituting groups was performed. Both single crystal X-ray diffraction analysis and molecular modeling analysis provide a detailed picture of molecular structure on molecular level and show good consistence with each other. On the basis of structural analysis, the effects of molecular structure parameters on ring-opening polymerization of ben-zoxazines have been explored.展开更多
A simple and efficient synthetic protocol has been developed using a one-pot multicomponent reaction （MCR） involving 2-aminophenols, dialkyl acetylenedicarboxylates, and ethyl bromopyruvate in poly（ethyleneglycol）...A simple and efficient synthetic protocol has been developed using a one-pot multicomponent reaction （MCR） involving 2-aminophenols, dialkyl acetylenedicarboxylates, and ethyl bromopyruvate in poly（ethyleneglycol）. This protocol was utilized to prepare novel pyrrolo[2,1-c][1,4]benzoxazines in excellent yields.展开更多
The synthesis of a new series of six-membered N,N′-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines （5a-e） was achieved in excellent yields by Mannich-type condensation of N,N′-diarylsubstituted methyle...The synthesis of a new series of six-membered N,N′-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines （5a-e） was achieved in excellent yields by Mannich-type condensation of N,N′-diarylsubstituted methylene-bis-o-hydroxybenzyl amines （4a- e） with formaldehyde in chloroform at reflux. These amines （4a-e） were obtained by the reduction of N, Nr-diarylsubstituted methylene-bis-o-hydroxybenzyl imines （3a-e） with NaBH4, which inturn were obtained by the condensation of methylene-bissalicylaldehyde （2） with various substituted arylamines.展开更多
基金the National Natural Science Foundation of China (Grant No. 59573008).
文摘A colorless monoclinic crystal of dichloro-benzoxazine was obtained and examined by single crystal X-ray diffraction analysis. At the same time, molecular modeling analysis of nine benzoxazine compounds with different substituting groups was performed. Both single crystal X-ray diffraction analysis and molecular modeling analysis provide a detailed picture of molecular structure on molecular level and show good consistence with each other. On the basis of structural analysis, the effects of molecular structure parameters on ring-opening polymerization of ben-zoxazines have been explored.
基金Sanandaj Branch,Islamic Azad University Research Council for the financial support
文摘A simple and efficient synthetic protocol has been developed using a one-pot multicomponent reaction （MCR） involving 2-aminophenols, dialkyl acetylenedicarboxylates, and ethyl bromopyruvate in poly（ethyleneglycol）. This protocol was utilized to prepare novel pyrrolo[2,1-c][1,4]benzoxazines in excellent yields.
文摘The synthesis of a new series of six-membered N,N′-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines （5a-e） was achieved in excellent yields by Mannich-type condensation of N,N′-diarylsubstituted methylene-bis-o-hydroxybenzyl amines （4a- e） with formaldehyde in chloroform at reflux. These amines （4a-e） were obtained by the reduction of N, Nr-diarylsubstituted methylene-bis-o-hydroxybenzyl imines （3a-e） with NaBH4, which inturn were obtained by the condensation of methylene-bissalicylaldehyde （2） with various substituted arylamines.
