Compounds of formula (I)
and pharmaceutically acceptable salts thereof, wherein R
1
, R
2
, R
3
, R
4
, L
1
and G
1
are as defined in the specification, are useful in treating conditions or disorders prevented by or ameliorated by positive allosteric modulation of the γ-aminobutyric acid B (GABA-B) receptor. Methods for making the compounds are described. Also described are pharmaceutical compositions of compounds of formula (I), and methods for using such compounds and compositions.
Synthesis and Applications of Unquaternized C-Bound Boron Enolates
作者:Elvis Wang Hei Ng、Kam-Hung Low、Pauline Chiu
DOI:10.1021/jacs.8b00614
日期:2018.3.14
boron enolates by a ligand-controlled O-to-C isomerization is reported. Using this protocol, C-bound pinacolboron enolates have been isolated in pure form for the first time, and have been fully characterized by NMR spectroscopy and X-ray crystallography. In contrast to the general perception, such C-boron enolates are stable without coordinative saturation at the boron. Moreover, C-boron enolates present
报道了一种通过配体控制的 O-to-C 异构化制备未季铵化 C 结合硼烯醇化物的通用和简便方法。使用该协议,首次以纯形式分离了 C 结合的频哪醇烯醇化物,并通过核磁共振光谱和 X 射线晶体学进行了充分表征。与一般看法相反,这种 C-硼烯醇化物是稳定的,在硼处没有配位饱和。此外,C-硼烯醇化物呈现出与O-硼烯醇化物不同的反应性,并且证明了它们在CO和CC键形成中的应用。
A Metallaphotoredox Strategy for the Cross‐Electrophile Coupling of α‐Chloro Carbonyls with Aryl Halides
作者:Tiffany Q. Chen、David W. C. MacMillan
DOI:10.1002/anie.201909072
日期:2019.10.7
effective for a wide variety of aryl bromide coupling partners, is predicated upon a halogen atom abstraction/nickel radical-capture mechanism that is generically successful across an extensive range of carbonyl substrates. The construction and use of arylacetic acid products have further enabled two-step protocols for the delivery of valuable building blocks for medicinal chemistry, such as aryldifluoromethyl
Palladium-catalyzed linear-selective hydroesterification of vinyl arenes with alcohols enabled by diphosphine ligands derived from bis[2-(diphenylphosphino)ethyl]amides has been developed. A variety of 3-arylpropanoate esters were obtained in high yields and regioselectivity. The robustness of this methodology was further demonstrated by the efficient gram-scale synthesis of the ethyl 3-phenylpropanoate
Compounds of formula (I)
and pharmaceutically acceptable salts thereof, wherein R1, R2, R3, R4, L1 and G1 are as defined in the specification, are useful in treating conditions or disorders prevented by or ameliorated by positive allosteric modulation of the γ-aminobutyric acid B (GABA-B) receptor. Methods for making the compounds are described. Also described are pharmaceutical compositions of compounds of formula (I), and methods for using such compounds and compositions.