Thrombin Inhibitors from the Freshwater Cyanobacterium <i>Anabaena compacta</i>
作者:Andrea Roxanne J. Anas、Takaya Kisugi、Taiki Umezawa、Fuyuhiko Matsuda、Marc R. Campitelli、Ronald J. Quinn、Tatsufumi Okino
DOI:10.1021/np300282a
日期:2012.9.28
Bioassay-guided investigation of the cyanobacterium Anabaena compacta extracts afforded spumigin J (1) and the known thrombin inhibitor spumigin A (2). The absolute configuration of 1 was analyzed by advanced Marfey's methodology. Compounds 1 and 2 inhibited thrombin with EC50 values of 4.9 and 2.1 mu M, and 0.7 and 0.2 mu M in the cathepsin B inhibitory assay, respectively. The MM-GBSA methodology predicted spumigin A with 2S-4-methylproline as the better thrombin inhibitor.
Concise, Stereoselective Route to the Four Diastereoisomers of 4-Methylproline
作者:Annabel C. Murphy、Maya I. Mitova、John W. Blunt、Murray H. G. Munro
DOI:10.1021/np070673w
日期:2008.5.1
has often been hindered by long reaction sequences or low stereoselectivity in the synthesis leading to reference samples. The preparation of the four diastereoisomers of 4-methylproline by a concise and stereoselective route is presented and features a six-step route with late-stage stereodivergence, good stereoselectivity for both cis- and trans-series (75% and 88% de, respectively), and good overall
Hetero-Diels–Alder Addition of Ethyl 2-Nitrosoacrylate to (Z)-Prop-1-enyl Ethers. Stereoselective Synthesis of a Precursor to Sacubitril
作者:John K. Gallos、Christos I. Stathakis、Stavroula A. Zisopoulou、Thanos Andreou、Theocharis V. Koftis
DOI:10.1055/a-2029-0015
日期:——
A novel, conceptually distinct synthesis of a key precursor to sacubitril, an antihypertensive drug, is presented. The well-demonstrated hetero-Diels–Alder addition of in situ generated nitrosoalkenes to electron-rich enol ethers was engaged to establish the required functionalities with controllable relative stereochemistry. An asymmetric variant of the enol ether enabled access to the target molecule