甲硅烷基化的氟代烯烃是具有互补反应性的重要合成中间体,在天然产物,药物和人造材料的构造中起关键作用。通过选择性脱氟甲硅烷基化将通常高度稳定的氟代烯烃转化为甲硅烷基化的氟代烯烃是一项艰巨的任务。本文中,我们报道了在烷氧基碱的存在下,各种氟代烯烃与甲硅烷基硼酸酯的简单,廉价和稳健的脱氟甲硅烷基化反应,以直接合成各种甲硅烷基化的氟代烯烃。该协议具有温和而安全的反应条件,可避免催化剂,过渡金属,配体和高反应温度,并能耐受各种氟代烯烃底物,而不会影响效率。N 2'或S N V取代,这是该碱基介导的脱氟甲硅烷基化的原因。
Stereoselective Carbonyl Olefination with Fluorosulfoximines: Facile Access to <i>Z</i>
or <i>E</i>
Terminal Monofluoroalkenes
作者:Qinghe Liu、Xiao Shen、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201610127
日期:2017.1.9
such as homeostasis regulators and mechanism‐based enzyme inhibitors. However, it is difficult to control the stereoselectivity of known carbonyl olefination reactions, and olefinmetathesis is limited to disubstituted terminal monofluoroalkenes. Although sulfoximines have been used extensively in organic synthesis, reports on their use in carbonyl olefination reactions have not appeared to date. Herein
Stereospecific synthesis of monofluoroalkenes and their deuterated analogues via Ag-catalyzed decarboxylation
作者:Xinyuan Liu、Fuxing Shi、Chaochao Jin、Binbin Liu、Ming Lei、Jiajing Tan
DOI:10.1016/j.jcat.2022.08.008
日期:2022.9
bioactivity. Although the preparation of aryl and aliphatic fluorides have been extensively investigated, alkenyl fluoride synthesis remains to be under-developed due to challenges associated with stereoselectivity control. Herein, we report a practical method for stereospecificsynthesis of terminal alkenyl fluorides, and especially their deuterated analogues using an Ag-catalyzed decarboxylative protonation/deuteration
氟化有机分子已在药物化学中得到广泛应用,因为氟的掺入通常会改善代谢稳定性、亲脂性和生物活性。尽管芳基和脂肪族氟化物的制备已被广泛研究,但由于与立体选择性控制相关的挑战,烯基氟化物的合成仍有待开发。在此,我们报告了一种使用银催化脱羧质子化/氘化策略立体定向合成末端烯基氟化物的实用方法,尤其是它们的氘代类似物。广泛的底物范围、放大实验和产品衍生化证明了合成效用。DFT 计算将双分子 NMP 与 Ag 的配位识别为有利模式,阐明了机理途径,
1-tert-Butyl-1H-tetrazol-5-yl fluoromethyl sulfone (TBTSO2CH2F): a versatile fluoromethylidene synthon and its use in the synthesis of monofluorinated alkenes via Julia–Kocienski olefination
作者:Lingui Zhu、Chuanfa Ni、Yanchuan Zhao、Jinbo Hu
DOI:10.1016/j.tet.2010.04.113
日期:2010.7
1-tert-Butyl-1H-tetrazol-5-yl fluoromethyl sulfone (TBTSO2CH2F) has been developed as a new and efficient fluoromethylidene synthon for the synthesis of both terminal and internal monofluoroalkenes via Julia-Kocienski olefination reaction. The base-mediated reaction between TBTSO2CH2F and carbonyl compounds (aldehydes and ketones) provided terminal monofluoroalkenes in good yields with moderate E/Z selectivity. The dominance of E- or Z-fluoroalkenes could be controlled by selection of proper reaction solvent and temperature. TBTSO2CH2F reagent was also found to be readily a-alkylated, acylated, and phenylsulfonylated to give corresponding alpha-functionalized fluorosulfones, which could be used in the synthesis of alkyl-, acyl-, and phenylsulfonyl-substituted internal monofluoroalkenes via Julia-Kocienski olefination reactions. (C) 2010 Elsevier Ltd. All rights reserved.