5,5,5-Trifluorolaevulic acid and some derived compounds
作者:P. Brown、J. Burdon、T.J. Smith、J.C. Tatlow
DOI:10.1016/s0040-4020(01)97803-2
日期:——
5,5,5-Trifluorolaevulic acid (II) has been prepared by the acidic hydrolysis of the Claisen condensation product (I) of ethyl trifluoroacetate and diethyl succinate. Dehydration of the acid (II) with phosphoric oxide gave 4-hydroxy-5,5,5-trifluoropent-3-enoic acid lactone (III). Reduction of either this lactone or the acid (II) with lithium aluminium hydride gave 5,5,5-trifluoropentane-1,4-diol (IV)
An efficient Ni–(S,S)-Ph-BPE complex that catalyzed asymmetrichydrogenation of cyclic N-acyl hydrazones has been developed to produce various chiral cyclic hydrazines in high yields with excellent enantioselectivities of up to >99% enantiomeric excess. Moreover, the hydrogenation can not only proceed smoothly on a gram scale under lower catalyst loading (S/C = 3000) without any decrease of enantioselectivity
已开发出一种高效的 Ni-( S , S )-Ph-BPE 络合物,可催化环状N-酰基腙的不对称氢化,以高产率生产各种手性环状肼,具有高达 >99% 对映体过量的出色对映选择性。此外,氢化不仅可以在较低的催化剂负载量(S/C = 3000)下顺利进行,而且对映选择性没有任何降低,而且还可以应用于 RIP-1 激酶抑制剂的不对称合成。
Synthesis of Indolizidine Derivatives Trifluoromethylated at Bridgehead Position via Acyl Iminium Ion Intermediates Derived from Ring-Chain Tautomerism of 5,5,5-Trifluoro-4-oxopentanoyl Arylethylamides
作者:Shoji Eguchi、Takashi Okano、Tsutomu Sakaida
DOI:10.3987/com-96-s12
日期:——
The 2′-Trifluoromethyl Analogue of Indomethacin Is a Potent and Selective COX-2 Inhibitor
作者:Anna L. Blobaum、Md. Jashim Uddin、Andrew S. Felts、Brenda C. Crews、Carol A. Rouzer、Lawrence J. Marnett
DOI:10.1021/ml400066a
日期:2013.5.9
Indomethacin is a potent, time-dependent, nonselective inhibitor of the cyclooxygenase enzymes (COX-1 and COX-2). Deletion of the 2'-methyl group of indomethacin produces a weak, reversible COX inhibitor, leading us to explore functionality at that position. Here, we report that substitution of the 2'-methyl group of indomethacin with trifluoromethyl produces CF3-indomethacin, a tight-binding inhibitor with kinetic properties similar to those of indomethacin and unexpected COX-2 selectivity (IC50 mCOX-2 = 267 nM; IC50 oCOX-1 > 100 mu M). Studies with site-directed mutants reveal that COX-2 selectivity results from insertion of the CF3 group into a small hydrophobic pocket formed by Ala-527, Val-349, Ser-530, and Leu-531 and projection of the methoxy group toward a side pocket bordered by Val-523. CF3-indomethacin inhibited COX-2 activity in human head and neck squamous cell carcinoma cells and exhibited in vivo anti-inflammatory activity in the carrageenan-induced rat paw edema model with similar potency to that of indomethacin.