以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质...以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质谱联用技术分别研究了2-L-天冬氨酸-2-脱氧-D-葡萄糖的热失重和热裂解行为。采用1,1-二苯基-2-三硝基苯肼(1-diphenyl-2-picrylhydrazyl,DPPH)自由基清除法和还原能力法对其体外抗氧化活性进行测定。结果表明:合成产物为目标化合物;目标化合物的裂解温度为187.8℃,700℃时总失重达到91.26%;目标化合物裂解产物的数量随温度的升高而增多,裂解产物包括杂环类、酮类、羧酸类、醛类、酚类、烯烃类、醇类和芳烃类等化合物,裂解产物表现出烘焙香、甜香、焦甜香、可可香、花香和奶香等香韵;目标产物具有较强的DPPH自由基清除能力和还原能力,是一种潜在的抗氧化剂。展开更多
Chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines were described,which were established on the basis of either a C—C bond cleavage or a rearrangement process of a reaction inte rmediate.These reactio...Chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines were described,which were established on the basis of either a C—C bond cleavage or a rearrangement process of a reaction inte rmediate.These reactions proceeded in a condition-determined manner with good functional group tolerance.In the first model,2,2-dimethoxyacetaldehyde reacted with aniline to form a new C—N bond,in the presence of O_(2),via a C—C bond cleavage reaction.However,in the second model,by performing the reaction in the absence of O_(2),Heyns rearrangement occurred and generated a new C—O bond to form methyl phenylglycinate.Such condition-determined reactions not only offered the new way for valueadded conversion of biomass-derived platform molecule,2,2-dimethoxyacetaldehyde,but also provided efficient methods for the synthesis of N-arylformamides and methyl phenylglycinates.展开更多
文摘以D-果糖和L-天冬氨酸单钾盐为原料合成了2-L-天冬氨酸-2-脱氧-D-葡萄糖,利用傅里叶变换红外光谱、~1H核磁共振(nuclear magnetic resonance,NMR)、^(13)C NMR和高分辨率质谱技术进行结构表征。应用热重-微商热重和在线裂解气相色谱/质谱联用技术分别研究了2-L-天冬氨酸-2-脱氧-D-葡萄糖的热失重和热裂解行为。采用1,1-二苯基-2-三硝基苯肼(1-diphenyl-2-picrylhydrazyl,DPPH)自由基清除法和还原能力法对其体外抗氧化活性进行测定。结果表明:合成产物为目标化合物;目标化合物的裂解温度为187.8℃,700℃时总失重达到91.26%;目标化合物裂解产物的数量随温度的升高而增多,裂解产物包括杂环类、酮类、羧酸类、醛类、酚类、烯烃类、醇类和芳烃类等化合物,裂解产物表现出烘焙香、甜香、焦甜香、可可香、花香和奶香等香韵;目标产物具有较强的DPPH自由基清除能力和还原能力,是一种潜在的抗氧化剂。
基金the National Natural Science Foundation of China for financial support(Nos.2171101076,21872060 and 21902054)Fundamental Research Funds for the Central Universities(No.2019kfyXJJS072)Natural Science Foundation of Hubei Province(No.2019CFB219)。
文摘Chemodivergent reactions of 2,2-dimethoxyacetaldehyde and anilines were described,which were established on the basis of either a C—C bond cleavage or a rearrangement process of a reaction inte rmediate.These reactions proceeded in a condition-determined manner with good functional group tolerance.In the first model,2,2-dimethoxyacetaldehyde reacted with aniline to form a new C—N bond,in the presence of O_(2),via a C—C bond cleavage reaction.However,in the second model,by performing the reaction in the absence of O_(2),Heyns rearrangement occurred and generated a new C—O bond to form methyl phenylglycinate.Such condition-determined reactions not only offered the new way for valueadded conversion of biomass-derived platform molecule,2,2-dimethoxyacetaldehyde,but also provided efficient methods for the synthesis of N-arylformamides and methyl phenylglycinates.
