Synthesis of Itaconic Acid Ester Analogues via Self-Aldol Condensation of Ethyl Pyruvate Catalyzed by Hafnium BEA Zeolites
作者:Yuran Wang、Jennifer D. Lewis、Yuriy Román-Leshkov
DOI:10.1021/acscatal.6b00561
日期:2016.5.6
Lewis acidic zeolites are used to synthesize unsaturated dicarboxylic acidesters via aldol condensation of keto esters. Hafnium-containing BEA (Hf-BEA) zeolites catalyze the condensation of ethyl pyruvate into diethyl 2-methyl-4-oxopent-2-enedioate and diethyl 2-methylene-4-oxopentanedioate (an itaconic acidester analogue) with a selectivity of ca. 80% at ca. 60% conversion in a packed-bed reactor
路易斯酸性沸石用于通过酮酯的羟醛缩合来合成不饱和二羧酸酯。含的BEA(Hf-BEA)沸石催化丙酮酸乙酯缩合成2-甲基-4-氧代戊二烯-2-烯二酸二乙酯和2-亚甲基-4-氧代戊二烯酸二乙酯(衣康酸酯类似物) 。约80%在填充床反应器中60%的转化率。催化剂在运行中可稳定132小时,达到5110 mol EP mol Hf –1的周转数。分析Hf-BEA在流动条件下的动力学行为以及用Na交换沸石进行的研究表明,Hf(IV)的开放位点具有路易斯和布朗斯台德酸催化的双重功能。
SAR insights into TET2 catalytic domain inhibition: Synthesis of 2-Hydroxy-4-Methylene-pentanedicarboxylates
作者:Anand D. Tiwari、Yihong Guan、Dale R. Grabowski、Jaroslaw P. Maciejewski、Babal K. Jha、James G. Phillips
DOI:10.1016/j.bmc.2021.116141
日期:2021.6
The TET (Ten-Eleven Translocation) dioxygenase enzyme family comprising 3 members, TET1-3, play key roles in DNA demethylation. These processes regulate transcription programs that determine cell lineage, survival, proliferation, and differentiation. The impetus for our investigations described here is derived from the need to develop illuminating smallmolecule probes for TET enzymes with cellular