Upon treatment with catalytic Pd-2(dba)(3) . CHCl3 in the presence of AcOH, the enyne compounds were subjected to hydropalladation followed by cyclic carbopalladation to form the homoallylpalladium complexes, which subsequently underwent in situ Stille type cross coupling with various vinyltin reagents to give the cyclized products bearing allyl appendages. (C) 1997 Elsevier Science Ltd.
A new synthetic approach to (+)-lactacystin based on radical cyclisation of enantiopure α-ethynyl substituted serine derivatives to 4-methylenepyrrolidinones
作者:Gerald Pattenden、Gwenaëlla Rescourio
DOI:10.1039/b806681g
日期:——
stereoselective manner and led to the methylsulfanyl derivative 48 (ca. 9:1 selectivity). Manipulation of the functionality in 48, using two separate sequences, then led to the substituted pyrrolidinones 49b, 50 and 53 which are advanced intermediates in a previous synthesis of (+)-lactacystin 1. In related studies, the acetylenic bromoamide 28a containing all the carbon atoms in lactacystin was synthesised
Total Synthesis of Thiamyxins A–C and Thiamyxin E, a Potent Class of RNA‐Virus‐Inhibiting (Cyclo)depsipeptides
作者:Kevin Bauer、Uli Kazmaier
DOI:10.1002/anie.202305445
日期:2023.8.7
A first totalsynthesis of thiamyxins A–C and E, an interesting group of natural products with antiviral activity and an acid-labile C2 exomethine position, is described. Overcoming the problem of inseparable diastereomers of the open-chain variants, thiamyxin C and E were obtained by opening the cyclic thiamyxins A and B.
描述了硫霉素 A-C 和 E 的首次全合成,这是一组有趣的天然产物,具有抗病毒活性和酸不稳定的 C2 外甲氨酸位置。克服了开链变体不可分离的非对映异构体的问题,通过打开环状硫霉素A和B获得了硫霉素C和E。