From Levulinic Acid to Biheterocycles: Synthesis of 1-[(5-Hydroxy-5-trifluoromethyl-3-substituted-4,5-dihydro-1H-pyrazol-1-yl)-3-(5-trifluoromethyl-1H-pyrazol-3-yl)propan-1-ones
摘要:
We develop an efficient method to synthesize novel propionyl-spaced bisheterocyclic compounds. It entails cyclocondensation of 3-(5-trifluoromethyl-1H-pyrazol-3-yl)propanoyl hydrazide obtained from levulinic acid, with 1,1,1-trifluoro-4methoxy-3-alken-2-ones proceeding regiospecifically to 1-[(5-trifluoromethyl-5-hydroxy3-substituted-4,5-dihydro-1H-pyrazol-1-yl)-3-(5-trifluoromethyl-1H-pyrazol-3-yl)propan- I-one derivatives.
From Levulinic Acid to Biheterocycles: Synthesis of 1-[(5-Hydroxy-5-trifluoromethyl-3-substituted-4,5-dihydro-1H-pyrazol-1-yl)-3-(5-trifluoromethyl-1H-pyrazol-3-yl)propan-1-ones
摘要:
We develop an efficient method to synthesize novel propionyl-spaced bisheterocyclic compounds. It entails cyclocondensation of 3-(5-trifluoromethyl-1H-pyrazol-3-yl)propanoyl hydrazide obtained from levulinic acid, with 1,1,1-trifluoro-4methoxy-3-alken-2-ones proceeding regiospecifically to 1-[(5-trifluoromethyl-5-hydroxy3-substituted-4,5-dihydro-1H-pyrazol-1-yl)-3-(5-trifluoromethyl-1H-pyrazol-3-yl)propan- I-one derivatives.
From Renewable Levulinic Acid to a Diversity of 3-(Azol-3-yl)Propanoates
作者:Alex F. C. Flores、Luciana A. Piovesan、Lucas Pizzuti、Darlene C. Flores、Juliana L. Malavolta、Marcos A. P. Martins
DOI:10.1002/jhet.1774
日期:2014.5
3‐(trihalomethylated‐1,2‐azol‐3‐yl)propanoate is reported. Preparation of the key methyl 7,7,7‐trihalo‐4‐methoxy‐6‐oxohept‐4‐enoate precursors fromlevulinicacid is also described. The synthetic potential of this synthetic protocol was indicated by the production of several methyl and ethyl 3‐(isoxazol‐3‐yl)propanoates and 3‐(1H‐pyrazol‐3‐yl)propanoates, and the respective acid derivatives, in good (70–95%)
The synthesis of 5-[2-(trifluoromethylheteroaryl)-ethyl]-1,3,4-oxadiazoles derived from levulinic acid is reported. Cyclocondensations [4 + 1] between four different 5-[2-(trifluoromethylheteroaryl) propionylhydrazides derived from methyl 7,7,7-trifluoro-4-methoxy-6-oxo-4-heptenoate obtained from levulinic acid, and electrophilic orthoesters RC(OR)3 (where R = H, Me, Ph) and CS2 were carried out in
报道了衍生自乙酰丙酸的5- [2-(三氟甲基杂芳基)-乙基] -1,3,4-恶二唑的合成。衍生自乙酰丙酸的7,7,7-三氟-4-甲氧基-6-氧代-4-庚烯酸甲酯与亲电子原酸酯RC( OR)3(其中R = H,Me,Ph)和CS2在温和的培养基中进行。获得了良好的分离产物收率(69-96%)。使用H和C核磁共振(NMR)光谱和电喷雾电离与串联质谱(ESI MS / MS)数据对新的乙烯间隔双杂环的结构进行了表征。