regeneration presents a potential strategy for MetS treatment. Recently we disclosed the total synthesis of (+)-colletoic acid as a potent 11β-HSD1 inhibitor. Herein, we describe our improved processing chemistry for the synthesis of the colletoic acid core to access a diverse number of derivatives for evaluation against 11β-HSD1. The Evan's chiral auxiliary was utilized to construct the acyclic precursor
Sur la réaction de l'iodure de triméthylsilyle avec les alcools acétyléniques
作者:Jean-Louis Gras、You Yan Kong Win Chang、Marcel Bertrand
DOI:10.1016/s0040-4039(00)87672-8
日期:1982.1
Iodotrimethylsilane reacts with propargyl alcohols to give unsaturated halohydrins or unsaturated alkyl diiodides.
碘代三甲基硅烷与炔丙醇反应生成不饱和卤代醇或不饱和烷基二碘化物。
Insights into Long-Range Structural Effects on the Stereochemistry of Aldol Condensations: A Practical Total Synthesis of Desoxyepothilone F
作者:Chul Bom Lee、Zhicai Wu、Fei Zhang、Mark D. Chappell、Shawn J. Stachel、Ting-Chao Chou、Yongbiao Guan、Samuel J. Danishefsky
DOI:10.1021/ja010039j
日期:2001.6.1
high-yielding synthesis of dEpoF. The reduction of the keto group at C3 via a Noyori protocol after Suzuki coupling had proved to be very difficult. In our current approach, two consecutive aldol reactions are used to fashion the acyl sector. In the first aldol condensation, C6 becomes attached to C7. Following protection at C7, a two-carbon acetate equivalent is used to join C2 and C3 with very high asymmetric
Leucosceptroids are sesterterpenoids with potent antifeedant and antifungal activities. In this paper, efforts on two synthetic strategies toward stereoselective total synthesis of the leucosceptroid family of natural products are reported. Intramolecular addition cyclization strategy could lead to a stereochemically mismatched core structure, while intermolecular addition/ring-closing metathesis cyclization
Leucosceptroids 是具有强效拒食和抗真菌活性的二萜类化合物。在本文中,报告了两种合成策略对天然产物 leucosceptroid 家族的立体选择性全合成的努力。分子内加成环化策略可能导致立体化学错配的核心结构,而分子间加成/闭环复分解环化策略成功地提供了一种先进的普通中间体,该中间体带有八个连续的立体中心,包括三个四取代的中心,与所有立体化学完全匹配leucosceptroid H 中的三环骨架。该中间体向 leucosceptroid H 的后期转化在将仲羟基氧化为靶标中的羰基方面遇到了困难。而不是所需的氧化,
Four-Carbon Criegee Intermediate from Isoprene Ozonolysis: Methyl Vinyl Ketone Oxide Synthesis, Infrared Spectrum, and OH Production
作者:Victoria P. Barber、Shubhrangshu Pandit、Amy M. Green、Nisalak Trongsiriwat、Patrick J. Walsh、Stephen J. Klippenstein、Marsha I. Lester
DOI:10.1021/jacs.8b06010
日期:2018.8.29
In particular, unimolecular decay of MVK-OO is predicted to be the major source of hydroxyl radicals (OH) in isoprene ozonolysis. This study reports the initial laboratory synthesis and direct detection of MVK-OO through reaction of a photolytically generated, resonance-stabilized monoiodoalkene radical with O2. MVK-OO is characterized utilizing infrared (IR) action spectroscopy, in which IR activation