Towards the synthesis of amphidinolide B. An intramolecular Stille coupling approach
作者:M.Belén Cid、Gerald Pattenden
DOI:10.1016/s0040-4039(00)01242-9
日期:2000.9
synthetic approach towards the cytotoxic polyene polyol macrolide amphidinolide B (1), based on elaboration of the C1C13 carboxylic acid 4 and the C14C25 alcohol 3 units, their esterification to the iodostannyl ester 2, and an intramolecular Stille sp2–sp2couplingreaction, is described. In spite of adequate precedent and model experiments, circumstances conspired and the aforementioned coupling reaction
Stereoselective synthesis of C17–C34 fragment of antascomicin A
作者:Jithender Reddy Vakiti、Subhash Ghosh
DOI:10.1016/j.tetlet.2014.09.124
日期:2014.11
synthesis of C17–C34 unit of antascomicin A. A diastereoselective radical cyclization strategy has been developed to construct the highly substituted cyclohexane ring with required stereochemistry present in the molecule. Other key features in the synthesis are Sharpless asymmetric epoxidation, substrate controlled regioselective epoxide opening reaction with Gilman’s reagent, dithiane mediated CC bond formation
这封信描述了antascomicin A C17–C34单元的合成。已经开发了非对映选择性自由基环化策略来构建分子中存在所需立体化学的高度取代的环己烷环。合成中的其他关键特征是Sharpless不对称环氧化,与吉尔曼试剂进行的底物控制的区域选择性环氧化物开环反应,双噻吩介导的C C键形成反应和改性的Julia烯化反应。
Chemoselective reduction of aldehydes <i>via</i> a combination of NaBH<sub>4</sub> and acetylacetone
developed for the efficient chemoselective reduction of aldehydes in the presence of ketones. This method offers a useful synthetic protocol for distinguishing carbonyl reaction sites, and itssyntheticutility is reflected by its moisture tolerance and high efficiency in a variety of complex settings.