Phosphane-free Suzuki–Miyaura Coupling of Aryl Imidazolesulfonates with Arylboronic Acids and Potassium Aryltrifluoroborates under Aqueous Conditions
作者:José Francisco Cívicos、Mohammad Gholinejad、Diego A. Alonso、Carmen Nájera
DOI:10.1246/cl.2011.907
日期:2011.9.5
Aryl imidazole-1-sulfonates are efficiently cross-coupled with arylboronic acids and potassium aryltrifluoroborates using only 0.5 mol % of oxime palladacycles 1 under aqueous conditions at 110 °C. Under these simple phosphane-free reaction conditions a wide array of biaryl derivatives has been prepared in high yields. This methodology allows in situ phenol sulfonation and one-pot Suzuki arylation as well as the employment of microwave irradiation conditions.
Oxime-Palladacycle-Catalyzed Suzuki-Miyaura Arylation and Alkenylation of Aryl Imidazolesulfonates under Aqueous and Phosphane-Free Conditions
作者:José Francisco Cívicos、Diego A. Alonso、Carmen Nájera
DOI:10.1002/ejoc.201200368
日期:2012.7
Aryl and hetaroaryl imidazole-1-sulfonates are efficiently arylated and alkenylated with aryl- and alkenylboronic acids and potassium trifluoroborates by using 0.5 mol-% palladacycles 1 or Pd(OAc)2 at 110 °C under aqueous and phosphane-free conditions. Reactions can be performed by using conventional or microwave heating, leading to biaryls, stilbenes, and alkenylarenes in good to high yields, and
Synthesis of <sup>18</sup>F-Labeled Aryl Fluorosulfates via Nucleophilic Radiofluorination
作者:Young-Do Kwon、Min Ho Jeon、Nam Kyu Park、Jeong Kon Seo、Jeongmin Son、Young Hoon Ryu、Sung You Hong、Joong-Hyun Chun
DOI:10.1021/acs.orglett.0c01868
日期:2020.7.17
first SO2F2-free synthesis of aryl [18F]fluorosulfates from both phenolic and isolated aryl imidazylate precursors with cyclotron-produced 18F–. The radiochemical yields ranged from moderate to good with excellent functional group tolerance. The reliability of our approach was validated by the automated radiosynthesis of 4-acetamidophenyl [18F]fluorosulfate.
硫酰氟气体是SO 2 F转移的关键试剂。然而,由于无法获得气态[ 18 F] SO 2 F 2,传统的SO 2 F转移反应具有局限性的18 F-放射化学转化。在此,我们报告了使用回旋加速器生产的18 F –酚和分离的芳基亚氨基磺酸酯前体,首次合成无SO 2 F 2的芳基[ 18 F]氟代硫酸盐–。放射化学收率范围从中等到良好,且具有出色的官能团耐受性。我们的方法的可靠性通过4-乙酰氨基苯基[ 18 F]氟硫酸盐的自动放射合成得到了验证。