Tetramethylammonium Fluoride Alcohol Adducts for S<sub>N</sub>Ar Fluorination
作者:María T. Morales-Colón、Yi Yang See、So Jeong Lee、Peter J. H. Scott、Douglas C. Bland、Melanie S. Sanford
DOI:10.1021/acs.orglett.1c01490
日期:2021.6.4
aprotic conditions to maintain the nucleophilicity of fluoride and suppress the generation of side products. This report addresses this challenge by leveraging tetramethylammonium fluoride alcohol adducts (Me4NF·ROH) as fluoride sources for SNAr fluorination. Through systematic tuning of the alcohol substituent (R), tetramethylammonium fluoride tert-amyl alcohol (Me4NF·t-AmylOH) was identified as an
亲核芳族氟化 (S N Ar) 是形成 C(sp 2 )-F 键的最常用方法之一。尽管最近取得了许多进展,但这些转化的长期限制是需要严格干燥的非质子条件来保持氟化物的亲核性并抑制副产物的产生。本报告通过利用四甲基氟化铵醇加合物 (Me 4 NF·ROH) 作为 S N Ar 氟化的氟化物来源解决了这一挑战。通过系统调整醇取代基 (R),四甲基氟化铵叔戊醇 (Me 4 NF· t-AmylOH) 被确定为在温和方便的条件下(DMSO 中 80°C,无需干燥试剂或溶剂)下用于 S N Ar 氟化的廉价、实用且台式稳定的试剂。展示了超过 50 种(杂)芳基卤化物和硝基芳烃亲电子试剂的底物范围。
[EN] 6-AMINO-PYRIMIDINE-4-CARBOXAMIDE DERIVATIVES AND RELATED COMPOUNDS WHICH BIND TO THE SPHINGOSINE 1-PHOSPHATE (S1P) RECEPTOR FOR THE TREATMENT OF MULTIPLE SCLEROSIS<br/>[FR] DÉRIVÉS DE 6-AMINO-PYRIMIDINE-4-CARBOXAMIDE ET COMPOSÉS ASSOCIÉS QUI SE FIXENT AU RÉCEPTEUR DE SPHINGOSINE-1-PHOSPHATE (S1P) DANS LE TRAITEMENT DE LA SCLÉROSE EN PLAQUES
申请人:SERONO LAB
公开号:WO2009019167A1
公开(公告)日:2009-02-12
The invention relates to compounds of formula (I): wherein X, W, Q, R, R1 and R2 have the meanings given in claim 1. The compounds are useful e.g. in the treatment of autoimmune disorders, such as multiple sclerosis.
Diastereoselective Synthesis of Dialkylated Bis(phosphino)ferrocenes: Their Use in Promoting Silver‐Mediated Nucleophilic Fluorination of Chloroquinolines
作者:Julien Roger、Sylviane Royer、Hélène Cattey、Aleksandr Savateev、Radomyr V. Smaliy、Aleksandr N. Kostyuk、Jean‐Cyrille Hierso
DOI:10.1002/ejic.201600502
日期:2017.1.10
and trimethylsilyl, has a significant influence on the stereoselectivity of the ensuing lithiation/phosphination reactions. Only the introduction of the tert-butyl groups ensures both a high yield and perfect diastereoselectivity, which leads to the exclusive formation of the rac planar chiral tert-butylated diphosphanes. The introduction of electron-rich and -poor phosphorus-based functional groups
报道了在膦基上带有芳基、烷基和杂环或多环取代基的二烷基化二茂铁基双(膦)的非对映选择性合成,以及它们在固态下的 X 射线结构分析和溶液中的多核 NMR 光谱表征. 在二茂铁主链上引入各种烷基,即叔丁基、异丙基和三甲基甲硅烷基,对随后的锂化/膦化反应的立体选择性有显着影响。只有引入叔丁基才能确保高产率和完美的非对映选择性,从而导致外消旋平面手性叔丁基化二膦的独家形成。引入富电子和贫磷基官能团,即呋喃基-、异丙基-、环己基-、苯基-、实现了间甲基膦基和苯并膦吲哚,并以中等至高产率得到新的烷基化二茂铁基二膦。进行了研究以将这些强大的烷基化二膦作为助剂应用于非常具有挑战性的钯催化的氯喹啉在 C-Cl 键上的亲核氟化。出乎意料的是,二茂铁基膦的显着有利影响是通过使用商业 AgF 试剂进行这种氟化而证明的,这使得任何钯添加都无用。因此,这种创新的亲核氟化避免了苛刻的条件(严格无水)和高度专业化的试剂。
6-AMINO-PYRIMIDINE-4-CARBOXAMIDE DERIVATIVES AND RELATED COMPOUNDS WHICH BIND TO THE SPHINGOSINE 1-PHOSPHATE (S1P) RECEPTOR FOR THE TREATMENT OF MULTIPLE SCLEROSIS
申请人:Merck Serono Sa
公开号:US20130109669A1
公开(公告)日:2013-05-02
The invention relates to compounds of formula (I):
wherein X, W, Q, R, R
1
and R
2
have the meanings given in claim
1
. The compounds are useful e.g. in the treatment of autoimmune disorders, such as multiple sclerosis.
Direct C–H fluorination is an efficient strategy to construct aromatic C–F bonds, but the cleavage of specific C–Hbonds in the presence of other functional groups and the high barrier of C–F bond formation make the transformation challenging. Progress for the electrophilic fluorination of arenes has been reported, but a similar transformation for electron-deficient azaarenes has remained elusive due