In an attempt to find new antitumor agents,a novel class of chromone compounds with a benzimidazole or a benzoxazole ring in positions 2 or 6 were synthesized via condensation in polyphosphoric acid(PPA) by using chro...In an attempt to find new antitumor agents,a novel class of chromone compounds with a benzimidazole or a benzoxazole ring in positions 2 or 6 were synthesized via condensation in polyphosphoric acid(PPA) by using chromone acids as the starting materials. During the preparation process,it was found that PPA could cleave the chromone ring to produce a ring-opening compound(6). The molar ratio of the chromone compound(5) to the ring-opening compound(6) varied with the change of reaction temperature and time. Based on MTT protocol,the antitumor activity of each of the compounds obtained was evaluated against three human cancer cell lines: KB(oral epidermal),A2780(ovary) and Bel7402(liver). The IC_ 50 varied from 54.7 μmol/L to more than 180 μmol/L.展开更多
6-Substituted 5,8-O-dimethyl-1,4-naphthoquinones（6-DMNQ）,the promising anticancer scaffolds,were selectively generated by oxidative demethylation of 2-substituted 1,4,5,8-tetramethoxynaphthalenes with CAN in EtOAc/H...6-Substituted 5,8-O-dimethyl-1,4-naphthoquinones（6-DMNQ）,the promising anticancer scaffolds,were selectively generated by oxidative demethylation of 2-substituted 1,4,5,8-tetramethoxynaphthalenes with CAN in EtOAc/H2O in comparatively high yields.An interesting finding was that apart from the reported electron-withdrawing effects of substituents on position 2 of naphthalene ring,regioselective synthesis of 6-DMNQ was largely dependent on the steric effects in CAN-mediated oxidation.The selective cytotoxicities of 6-DMNQ from the in vitro cell-based assays were exhibited between the cancer cells and normal cells.Moreover,most of sulfur-containing 6-DMNQ derivatives displayed better anticancer activities than the corresponding oxygen-containing ones,which could provide an available strategy for the design of 6-DMNQ derivatives as potential anticancer agents.展开更多
Several 6-aminoquinoline derivatives,which could be used in drug design,have been synthesized.The reaction conditions were comparatively studied,and the p-chloroaniline was used as optimum oxidant in Skraup-Doebner-Vo...Several 6-aminoquinoline derivatives,which could be used in drug design,have been synthesized.The reaction conditions were comparatively studied,and the p-chloroaniline was used as optimum oxidant in Skraup-Doebner-Von Miller reaction.The nitro group was reduced effectively by SnCl2 with no halo-removed occurred.展开更多
A visible light-promoted fast photochemical Wolff rearrangement was developed toward synthesis ofα-substituted amides in continuous flow with the use of a photochemical oscillatory flow reactor(POFR).The control expe...A visible light-promoted fast photochemical Wolff rearrangement was developed toward synthesis ofα-substituted amides in continuous flow with the use of a photochemical oscillatory flow reactor(POFR).The control experiment indicates that a fast process of the Wolff rearrangement(<40 s)is involved.Notably,this protocol does not require excess use of any reactants,and the resultingα-substituted amides could be isolated by recrystallization in good to excellent yields.展开更多
Additions of diethyl phosphite to α-nitroalkenes followed by the introduction of trimethylchlorosilane and an activated alkene, gave the corresponding title compounds via regioselective 1,3-dipolar cycloaddition in m...Additions of diethyl phosphite to α-nitroalkenes followed by the introduction of trimethylchlorosilane and an activated alkene, gave the corresponding title compounds via regioselective 1,3-dipolar cycloaddition in moderate yield.展开更多
目的总结CDK4/6抑制剂治疗乳腺癌所致不良反应的相关护理证据,为临床实践提供循证依据。方法采用PIPOST问题开发工具构建循证问题,按照“6S”证据金字塔模型,遵循自上而下的原则,系统检索BMJ Best Practice、Up To Date、澳大利亚乔安...目的总结CDK4/6抑制剂治疗乳腺癌所致不良反应的相关护理证据,为临床实践提供循证依据。方法采用PIPOST问题开发工具构建循证问题,按照“6S”证据金字塔模型,遵循自上而下的原则,系统检索BMJ Best Practice、Up To Date、澳大利亚乔安娜布里格斯研究所循证卫生保健数据库、美国国立指南数据库、美国国立综合癌症网络、加拿大医学会临床实践指南网、苏格兰校际指南网、国际指南协作网、英国国家卫生与临床优化研究所、新西兰指南协作组网站、加拿大安大护理学会、Pub Med、Web of Science、Cochrane Library、Embase、中国期刊全文数据库、万方学术期刊全文数据库、医脉通等,检索时限为建库起至2023年12月31日。由2~4名研究者进行文献筛选、质量评价、证据提取及整合。结果最终纳入17篇文献,其中包含1篇临床决策、1篇指南、2篇专家共识、4篇meta分析、1篇随机对照试验、2篇系统评价、6篇原始研究。从用药前评估、用药观察、皮肤护理、胃肠道反应管理、多学科协作管理、心理干预6个方面总结出17条证据。结论本研究总结了CDK4/6抑制剂治疗乳腺癌所致不良反应的相关护理证据,可为临床护理实践提供参考,护理人员可结合患者的临床症状与实际需求,实施规范化、个体化的护理干预。展开更多
Proceeding from natural amino acid L-asparagine and commercially available aldehydes a stereoselective synthesis was developed of (2S,4S)-2-alkyl(aryl)-3-(3-sulfanylpropanoyl)-6-oxohexahy- dropyrimidine-4-carboxylic a...Proceeding from natural amino acid L-asparagine and commercially available aldehydes a stereoselective synthesis was developed of (2S,4S)-2-alkyl(aryl)-3-(3-sulfanylpropanoyl)-6-oxohexahy- dropyrimidine-4-carboxylic acids, potential antihypertensive drugs, inhibitors of the angiotensin converting enzyme.展开更多
文摘In an attempt to find new antitumor agents,a novel class of chromone compounds with a benzimidazole or a benzoxazole ring in positions 2 or 6 were synthesized via condensation in polyphosphoric acid(PPA) by using chromone acids as the starting materials. During the preparation process,it was found that PPA could cleave the chromone ring to produce a ring-opening compound(6). The molar ratio of the chromone compound(5) to the ring-opening compound(6) varied with the change of reaction temperature and time. Based on MTT protocol,the antitumor activity of each of the compounds obtained was evaluated against three human cancer cell lines: KB(oral epidermal),A2780(ovary) and Bel7402(liver). The IC_ 50 varied from 54.7 μmol/L to more than 180 μmol/L.
基金supported by National Natural Science Foundation of China(No.81373274)Ph.D.Programs Foundation of Ministry of Education China(No.20120073110068)Shanghai Biomedical Supporting Funding(No.15431900600)
文摘6-Substituted 5,8-O-dimethyl-1,4-naphthoquinones（6-DMNQ）,the promising anticancer scaffolds,were selectively generated by oxidative demethylation of 2-substituted 1,4,5,8-tetramethoxynaphthalenes with CAN in EtOAc/H2O in comparatively high yields.An interesting finding was that apart from the reported electron-withdrawing effects of substituents on position 2 of naphthalene ring,regioselective synthesis of 6-DMNQ was largely dependent on the steric effects in CAN-mediated oxidation.The selective cytotoxicities of 6-DMNQ from the in vitro cell-based assays were exhibited between the cancer cells and normal cells.Moreover,most of sulfur-containing 6-DMNQ derivatives displayed better anticancer activities than the corresponding oxygen-containing ones,which could provide an available strategy for the design of 6-DMNQ derivatives as potential anticancer agents.
基金the financial support of this work by the National Science Foundation of China(No 20776085)the 973 Program of China(No2007CB209700)+2 种基金the STCSM of China(Nos10JC1406900 and 09XD1402400)the Foundation of Zhejiang Pharmaceutics CoLtd the Opening Foundation of Zhejiang Provincial Top Key Discipline
文摘Several 6-aminoquinoline derivatives,which could be used in drug design,have been synthesized.The reaction conditions were comparatively studied,and the p-chloroaniline was used as optimum oxidant in Skraup-Doebner-Von Miller reaction.The nitro group was reduced effectively by SnCl2 with no halo-removed occurred.
基金financial support from the National Natural Science Foundation of China(No.22208279)Financial support from the Fuzhou University(No.0041/511095)。
文摘A visible light-promoted fast photochemical Wolff rearrangement was developed toward synthesis ofα-substituted amides in continuous flow with the use of a photochemical oscillatory flow reactor(POFR).The control experiment indicates that a fast process of the Wolff rearrangement(<40 s)is involved.Notably,this protocol does not require excess use of any reactants,and the resultingα-substituted amides could be isolated by recrystallization in good to excellent yields.
文摘Additions of diethyl phosphite to α-nitroalkenes followed by the introduction of trimethylchlorosilane and an activated alkene, gave the corresponding title compounds via regioselective 1,3-dipolar cycloaddition in moderate yield.
文摘目的总结CDK4/6抑制剂治疗乳腺癌所致不良反应的相关护理证据,为临床实践提供循证依据。方法采用PIPOST问题开发工具构建循证问题,按照“6S”证据金字塔模型,遵循自上而下的原则,系统检索BMJ Best Practice、Up To Date、澳大利亚乔安娜布里格斯研究所循证卫生保健数据库、美国国立指南数据库、美国国立综合癌症网络、加拿大医学会临床实践指南网、苏格兰校际指南网、国际指南协作网、英国国家卫生与临床优化研究所、新西兰指南协作组网站、加拿大安大护理学会、Pub Med、Web of Science、Cochrane Library、Embase、中国期刊全文数据库、万方学术期刊全文数据库、医脉通等,检索时限为建库起至2023年12月31日。由2~4名研究者进行文献筛选、质量评价、证据提取及整合。结果最终纳入17篇文献,其中包含1篇临床决策、1篇指南、2篇专家共识、4篇meta分析、1篇随机对照试验、2篇系统评价、6篇原始研究。从用药前评估、用药观察、皮肤护理、胃肠道反应管理、多学科协作管理、心理干预6个方面总结出17条证据。结论本研究总结了CDK4/6抑制剂治疗乳腺癌所致不良反应的相关护理证据,可为临床护理实践提供参考,护理人员可结合患者的临床症状与实际需求,实施规范化、个体化的护理干预。
文摘Proceeding from natural amino acid L-asparagine and commercially available aldehydes a stereoselective synthesis was developed of (2S,4S)-2-alkyl(aryl)-3-(3-sulfanylpropanoyl)-6-oxohexahy- dropyrimidine-4-carboxylic acids, potential antihypertensive drugs, inhibitors of the angiotensin converting enzyme.
