我们报告了通过亲电溴化(Br 2)或自由基三氟甲基化(NaSO 2 CF 3 / t BuOOH)在3位的吡啶酮和吡喃酮的区域选择性功能化。违反直觉的是,3位EW基团使羰基的拉伸能降低了6-23 cm -1。然而,与3-Br吡啶酮相比,3,5-二溴化使C O频率增加了10-22 cm -1。X射线晶体学显示吡啶酮互变异构体具有收缩的C O键度量。3-H→Br→CF 3系列的p K a值和1 H NMR位移揭示了酸度增加的预期趋势(p K a = 8.85→8.33→6.78,MeOH)和增加的化学位移(10.97→11.42→11.71DMSO- d 6)。我们得出的结论是,“ 3-positoin” EW基团通过“辅助”吸电子效应解释了CO延伸频率的反常下降,其中3-位EW基团协助负电性氧原子募集更多的电子密度,并且-结果–获得更多的氧阴离子特性(降低了C O键强度)。
Regioselective Chlorination and Suzuki-Miyaura Cross-Coupling of 4-Alkoxycoumarins, 4-Alkoxy-2-pyrones, and Related Heterocycles
作者:Aisling M. Prendergast、Gerard P. McGlacken
DOI:10.1002/ejoc.201700837
日期:2017.9.1
The chlorination of biologically important 4-alkoxycoumarins was achieved by using trichloroisocyanuric acid, a favorable alternative to N-chlorosuccinimide. The Suzuki–Miyaura cross-coupling of chlorinated coumarins with various boronic acids afforded the products in up to 99 % yield. This protocol was successfully applied to related 2-pyrone, 2-pyridone, and 2-quinolone derivatives.
Compounds for inhibition of alpha 4 beta 7 integrin
申请人:Gilead Sciences, Inc.
公开号:US11224600B2
公开(公告)日:2022-01-18
The present disclosure provides a compound of Formula (I):
or a pharmaceutically acceptable salt thereof as described herein. The present disclosure also provides pharmaceutical compositions comprising a compound of Formula (I), processes for preparing compounds of Formula (I), and therapeutic methods for treating inflammatory disease.
Intramolecular Palladium(II)-Catalyzed Regioselective 6-endo or 6-exo C–H Benzannulation: An Approach for the Diversity-Oriented Synthesis of Quinolinone Derivatives from Pyridones
intramolecular palladium(II)-catalyzed regioselective 6-endo-trig or 6-exo-trig annulation through direct C–H activation is presented as a method for the diversity-oriented synthesis of highly substituted quinolinones from pyridones. The reaction occurs under mild conditions and exhibits excellent regioselectivity, good functional group tolerance, and broad applications. This innovative approach has been
在此,提出了一种通过直接 C-H 活化的新型分子内钯 (II) 催化区域选择性 6- endo-trig或 6- exo-trig成环,作为从吡啶酮以多样性为导向合成高度取代的喹啉酮的方法。该反应在温和的条件下发生,具有优异的区域选择性、良好的官能团耐受性和广泛的应用。这一创新方法已成功用于合成 Glycopentanolone A 和 ( R )-(+)-Tipifarnib 中间体。
COMPOUNDS FOR INHIBITION OF ALPHA 4 BETA 7 INTEGRIN
申请人:Gilead Sciences, Inc.
公开号:US20200155563A1
公开(公告)日:2020-05-21
The present disclosure provides a compound of Formula (I):
or a pharmaceutically acceptable salt thereof as described herein. The present disclosure also provides pharmaceutical compositions comprising a compound of Formula (I), processes for preparing compounds of Formula (I), and therapeutic methods for treating inflammatory disease.