The disparate reaction pattern allowed the separate activation of non-ylidic S-alkyl and S-aryl bond. Under acidic conditions, sulfonium ylides serve as alkyl cation precursors which facilitate the alkylations. While under alkaline conditions, cleavage of non-ylidic S-aryl bond produces O-arylated compounds efficiently. The robustness of the protocols were established by the excellent compatibility of
and cyclohexane) and the relative rate of O—H insertion into methanol to stereospecific cyclopropanation of the olefin to C—H insertion into cyclohexane are calculated from the ratios of products and substrates. It is found (i) that the reactivities of the substrates decrease in the order of methanol, olefin and cyclohexane and (ii) that electron-donating substituents generally lead to reaction with
This invention relates to IP receptor antagonists selected from the group of compounds represented by Formula I:
1
where:
R
1
is a group represented by formula (A), (B) or (C);
2
d other substituents as defined in the specification, and their pharmaceutically acceptable ts or crystal forms thereof; and pharmaceutical compositions containing them; and methods their use as therapeutic agents.
This invention relates to IP receptor antagonists selected from the group of compounds represented by Formula I:
1
where:
R
1
is a group represented by formula (A), (B) or (C);
2
d other substituents as defined in the specification, and their pharmaceutically acceptable
ts or crystal forms thereof; and pharmaceutical compositions containing them; and methods
their use as therapeutic agents.
Chromium-catalyzed transfer hydrogenation of aromatic aldehydes facilitated by a simple metal carbonyl complex
作者:Daniel Timelthaler、Christoph Topf
DOI:10.1016/j.jcat.2022.07.001
日期:2022.9
We communicate a simple method for the transferhydrogenation of aromatic aldehydes in i-PrOH effected by the cost-effective and easy-to-handle [Cr(CO)6]. The reactions are readily carried in Ar-flushed tubes without further need of special equipment. Functional groups are widely tolerated and, if desired, the catalytic transformations can be further promoted through the addition of trimethylamine
我们介绍了一种在i -PrOH中转移氢化芳香醛的简单方法,该方法受成本效益高且易于处理的 [Cr(CO) 6 ] 的影响。反应很容易在 Ar 冲洗管中进行,无需进一步的特殊设备。官能团具有广泛的耐受性,如果需要,可以通过添加三甲胺N-氧化物 (TMAO) 进一步促进催化转化。这为在温和反应条件下处理热不稳定底物铺平了道路。此外,所介绍的方法适用于苯甲醇衍生物的氘代。