描述了NaNO 2 /K 2 S 2 O 8介导的3-甲酰基色酮在良性条件下的去甲酰肟化环收缩(DORC)或去甲酰烷氧基肟化(DAO)双功能化反应。3-甲酰色酮的 DORC 发生在 K 2 S 2 O 8、NaNO 2和 H 2 O 的存在下,生成 2-羟基亚氨基苯并呋喃-3-酮,而 DAO 的特点是 3-甲酰色酮在 K 存在下的双功能化2 S 2 O 8 , NaNO 2和 ROH(醇)得到 2-烷氧基-3-(羟基亚氨基)色满酮。初步机理研究表明,NO + NO 3 -(NO 2自由基二聚体的一种形式)最初添加到 3-甲酰色酮的富电子 C 3位点以形成阳离子中间体,然后攻击亲核试剂如 H 2 O或ROH形成半缩醛或缩醛中间体。随后,半缩醛经历串联去甲酰基化、开环和闭环过程,得到2-羟基亚氨基苯并呋喃-3-酮,而乙缩醛经历去甲酰基化得到2-烷氧基-3-(羟基亚氨基)色满酮。
[EN] MODULATORS OF STIMULATOR OF INTERFERON GENES (STING)<br/>[FR] MODULATEURS DU STIMULATEUR DES GÈNES DE L'INTERFÉRON (SING)
申请人:RYVU THERAPEUTICS S A
公开号:WO2019238786A1
公开(公告)日:2019-12-19
The present invention relates to compounds of formula (I) and salts, stereoisomers, tautomers or N-oxides thereof that are useful as modulators of STING (Stimulator of Interferon Genes). The present invention further relates to the compounds of formula (I) for use as a medicament and to a pharmaceutical composition comprising said compounds.
Lewis base catalyzed [4+2] annulationreactions between electron‐deficient chromone oxa‐ and azadienes and acetylene carboxylates provide tricyclicbenzopyronesinspired by naturalproducts. An asymmetricsynthesis of the tricyclicbenzopyrones was developed by using modified cinchona alkaloids as enantiodifferentiating Lewis base catalysts.
Eco-friendly organocatalyst- and reagent-controlled selective construction of diverse and multifunctionalized 2-hydroxybenzophenone frameworks for potent UV-A/B filters by cascade benzannulation
作者:Muhammad Saeed Akhtar、Raju S. Thombal、Ramuel John Inductivo Tamargo、Won-Guen Yang、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/d0gc01011a
日期:——
2-hydroxy-3′-formylbenzophenones and [4 + 2] cycloaddition for 2-hydroxybenzophenones. With this methodology, an unprecedented double benzannulation allows one-pot construction of diverse 7-(2′-hydroxybenzoyl)-2-naphthaldehydes via [3 + 3 + 4] cycloaddition. This protocol features a broad substrate scope, high functional-group tolerance, and operational simplicity in an environmentally benign green solvent
Base-Promoted Denitrogenative/Deoxygenative/Deformylative Benzannulation of <i>N</i>-Tosylhydrazones with 3-Formylchromones for Diverse and Polyfunctionalized Xanthones
作者:Rajeev Shrestha、Yong Rok Lee
DOI:10.1021/acs.orglett.8b03106
日期:2018.11.16
simple and efficient base-promoted denitrogenative/deoxygenative/deformylative benzannulation is developed for the construction of biologically interesting polyfunctionalized xanthones starting from N-tosylhydrazones and two molecules of 3-formylchromones. This unprecedented protocol proceeds via a cascade diazo formation/Michael addition/denitrogenation/[4 + 2] cycloaddition/elimination/ring opening. The
A Brønsted acid controlled Diels-Alder reaction of 3-vinylchromones with arynes has been developed. By employing different kinds and amounts of acid, 9-aryl-9H-xanthen-9-ols or ortho-hydroxybenzophenones could be controllably furnished in good yields in an atom- and step-economic manner.