The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%—95%) with short reaction time (5—8 min),...The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%—95%) with short reaction time (5—8 min), therefore providing a rapid and efficient method of synthesizing a variety of compounds containing two 4H-benzopyran units.展开更多
AIM To determine whether ONO 1078 {pranlukast, 4 oxo 8 [p (4 phenylbutyloxy) benzoyl amino] 2 (tetrazol 5 yl) 4H 1 benzopyran hemihydrate}, a potent leukotriene antagonist, has protective effect on focal cerebral isch...AIM To determine whether ONO 1078 {pranlukast, 4 oxo 8 [p (4 phenylbutyloxy) benzoyl amino] 2 (tetrazol 5 yl) 4H 1 benzopyran hemihydrate}, a potent leukotriene antagonist, has protective effect on focal cerebral ischemia in mice. METHODS Focal cerebral ischemia was induced by permanent middle cerebral artery (MCA) occlusion in mice. ONO 1078 (0 01, 0 05, 0 10 mg·kg -1 ), dexamethasone (0 5 mg·kg -1 ), nimodipine (0 2 mg·kg -1 ) or saline (control) were injected ip once daily for 3 days, and 30 min before MCA occlusion. Twenty four hours after cerebral ischemia, the neurological scores were evaluated, infarct volumes and areas of the right and left cerebral hemispheres were measured by computer imaging analysis. RESULTS ONO 1078, dexamethasone and nimodipine reduced the neurological scores. ONO 1078 and dexamethasone reduced the ratio of right/left hemisphere area, indicating inhibition of brain edema, while nimodipine showed no effect. ONO 1078 dose dependently reduced infarct size, and dexamethasone and nimodipine showed the same effect. CONCLUSION ONO 1078 showed protective effect on focal cerebral ischemia. This may represent a novel approach to the treatment of acute cerebral ischemia.展开更多
A one-pot synthesis of a series of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]-pyran derivatives via three-component coupling reactions of aldehydes, dimedone and malononitrilein room temperature ionic liquids （RTILs） wit...A one-pot synthesis of a series of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]-pyran derivatives via three-component coupling reactions of aldehydes, dimedone and malononitrilein room temperature ionic liquids （RTILs） without any catalyst has been reported. In the meantime, the reuse of ionic liquids and the effect of different ionic liquids as solvent on the reaction have also been investigated.展开更多
A new chromone derivative, 3-[1- (2, 4, 6-trihydroxyphenyl) 3-di-(4-hydroxyphenyl) 1-propanone-2-yl] 5,7-dihydroxy-8-di(4-hydroxyphenyl)methyl-4H-1-benzopyran-4-one, named as isomohsenone was isolated from the roots o...A new chromone derivative, 3-[1- (2, 4, 6-trihydroxyphenyl) 3-di-(4-hydroxyphenyl) 1-propanone-2-yl] 5,7-dihydroxy-8-di(4-hydroxyphenyl)methyl-4H-1-benzopyran-4-one, named as isomohsenone was isolated from the roots of Stellera chamaejasme L. together with known chamaechromone. Its structure was determined by the analysis of MS and NMR data, especially 2D NMR spectra.展开更多
基金Project supported by the Natural Science Foundation of China (No. 20372057) the Natural Science Foundation of Jiangsu Province (No. BK2001142) and the Natural Science Foundation of Jiangsu Education Department (No. 01KJB150008) the key Laboratory of
文摘The syntheses of 4H-benzopyran derivatives were investigated using dialdehyde as a key starting material. The reaction proceeds under microwave irradiation in good yield (87%—95%) with short reaction time (5—8 min), therefore providing a rapid and efficient method of synthesizing a variety of compounds containing two 4H-benzopyran units.
文摘AIM To determine whether ONO 1078 {pranlukast, 4 oxo 8 [p (4 phenylbutyloxy) benzoyl amino] 2 (tetrazol 5 yl) 4H 1 benzopyran hemihydrate}, a potent leukotriene antagonist, has protective effect on focal cerebral ischemia in mice. METHODS Focal cerebral ischemia was induced by permanent middle cerebral artery (MCA) occlusion in mice. ONO 1078 (0 01, 0 05, 0 10 mg·kg -1 ), dexamethasone (0 5 mg·kg -1 ), nimodipine (0 2 mg·kg -1 ) or saline (control) were injected ip once daily for 3 days, and 30 min before MCA occlusion. Twenty four hours after cerebral ischemia, the neurological scores were evaluated, infarct volumes and areas of the right and left cerebral hemispheres were measured by computer imaging analysis. RESULTS ONO 1078, dexamethasone and nimodipine reduced the neurological scores. ONO 1078 and dexamethasone reduced the ratio of right/left hemisphere area, indicating inhibition of brain edema, while nimodipine showed no effect. ONO 1078 dose dependently reduced infarct size, and dexamethasone and nimodipine showed the same effect. CONCLUSION ONO 1078 showed protective effect on focal cerebral ischemia. This may represent a novel approach to the treatment of acute cerebral ischemia.
基金Project supported by the National Natural Science Foundation of China （Nos. 20172039, 20472062） and Jiangsu Provincial Key Laboratory of Fine Petrochemical Technology （No. KF0402）.
文摘A one-pot synthesis of a series of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]-pyran derivatives via three-component coupling reactions of aldehydes, dimedone and malononitrilein room temperature ionic liquids （RTILs） without any catalyst has been reported. In the meantime, the reuse of ionic liquids and the effect of different ionic liquids as solvent on the reaction have also been investigated.
文摘A new chromone derivative, 3-[1- (2, 4, 6-trihydroxyphenyl) 3-di-(4-hydroxyphenyl) 1-propanone-2-yl] 5,7-dihydroxy-8-di(4-hydroxyphenyl)methyl-4H-1-benzopyran-4-one, named as isomohsenone was isolated from the roots of Stellera chamaejasme L. together with known chamaechromone. Its structure was determined by the analysis of MS and NMR data, especially 2D NMR spectra.
