A series of simple 4‐hydroxyprolinamides was synthesised and they were found to act as organocatalysts for the asymmetric conjugate addition of aldehydes to nitroolefins in excellent yields (98%), with complete diastereoselectivity (99:1, syn:anti) and enantioselectivity (98% ee for syn). Furthermore, the use of low catalyst loadings (5 mol%) and a low aldehyde molar excess (1.5 equivalents) were achieved
作者:Meng-Yang Chang、Hua-Ping Chen、Chun-Yu Lin、Chun-Li Pai
DOI:10.3987/com-05-10470
日期:——
A synthetic study toward pancracine (2) has been established starting from traps-(2S,4R)-4-hydroxyproline (1).
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.