Synthesis and Molecular Editing of Callyspongiolide, Part 1: The Alkyne Metathesis/
<i>trans</i>
‐Reduction Strategy
作者:Guillaume Mata、Bernhard Wölfl、Alois Fürstner
DOI:10.1002/chem.201804987
日期:2019.1.2
alkyne seem to prevent effective coordination of the substrate to the ruthenium catalyst, which must carry a bulky Cp* ligand to ensure high trans‐selectivity. This notion is supported by the preparation of a callyspongiolide analogue, in which the two methyl groups in question are excised; its formation by RCAM followed by trans‐hydrostannation/proto‐destannation was straightforward. In parallel work
The Formosalides: Structure Determination by Total Synthesis
作者:Saskia Schulthoff、James Y. Hamilton、Marc Heinrich、Yonghoon Kwon、Conny Wirtz、Alois Fürstner
DOI:10.1002/anie.202011472
日期:2021.1.4
Total synthesis allowed the constitution of the cytotoxic marine macrolides of the formosalide family to be confirmed and their previously unknown stereostructure to be assigned with confidence. The underlying blueprint was inherently modular to ensure that each conceivable isomer could be reached. This flexibility derived from the use of strictly catalyst controlled transformations to set the stereocenters
Diastereo- and Enantioselective Reactions of Bis(pinacolato)diboron, 1,3-Enynes, and Aldehydes Catalyzed by an Easily Accessible Bisphosphine–Cu Complex
作者:Fanke Meng、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1021/ja5071202
日期:2014.8.13
bis-phosphine and are complete in 8 h at ambient temperature; products are generated in 66–94% yield (after oxidation or catalytic cross-coupling), 90:10 to >98:2 diastereomeric ratio, and 85:15–99:1 enantiomeric ratio. Aryl-, heteroaryl-, alkenyl-, and alkyl-substituted aldehydes and enynes can be used. Utility is illustrated through catalytic alkylation and arylation of the organoboron products as well as applications
公开了涉及双(频哪醇)二硼[B2(pin)2]、1,3-烯炔和醛的催化对映选择性多组分方法;所得化合物含有主 C-B(pin) 键,以及炔烃和羟基取代的叔碳立体中心。一个关键特征是初始对映选择性 Cu-B(pin) 加成到炔烃取代的末端烯烃上。这个问题和其他关键的机械问题已经通过 DFT 计算进行了研究。反应由市售对映体纯双膦的 Cu 配合物促进,并在环境温度下 8 小时内完成;产物的产率为 66–94%(氧化或催化交叉偶联后),非对映体比例为 90:10 至 >98:2,对映体比例为 85:15–99:1。可以使用芳基-、杂芳基-、烯基-和烷基-取代的醛和烯炔。通过有机硼产物的催化烷基化和芳基化以及在泰洛内酯和霉素 IV 片段的合成中的应用来说明其实用性。
Diastereo- and Enantioselective Iridium-Catalyzed Carbonyl Propargylation from the Alcohol or Aldehyde Oxidation Level: 1,3-Enynes as Allenylmetal Equivalents
作者:Laina M. Geary、Sang Kook Woo、Joyce C. Leung、Michael J. Krische
DOI:10.1002/anie.201200239
日期:2012.3.19
chirality transfer: Exposure of conjugated enynes to alcohols in the presence of an iridium catalyst modified by a segphos ligand results in the generation of aldehyde–allenyliridium pairs and formation of enantiomerically enriched products of carbonyl anti‐(α‐methyl)propargylation (see scheme). An identical set of products are obtained fromaldehydes under related transfer hydrogenation conditions by