An enantioselectiveDiels–Alder reaction of 3-nitrocoumarins has been developed. A tryptophan-derived C 1-symmetric organoammonium thiourea catalyst promoted the reaction of 3-nitrocoumarins with Danishefsky’s diene to give the corresponding adducts with good enantioselectivity (up to 94% ee). One of the resulting adducts was converted into a chiral carbocyclic quaternary β-amino alcohol.
已经开发了 3-硝基香豆素的对映选择性 Diels-Alder 反应。色氨酸衍生的 C 1-对称有机铵硫脲催化剂促进了 3-硝基香豆素与丹麦谢夫斯基二烯的反应,得到具有良好对映选择性(高达 94% ee)的相应加合物。所得加合物之一被转化为手性碳环季 β-氨基醇。
Selected anthranilaminde pyridinamides and their use as pharmaceutical agents
申请人:Schering AG
公开号:US20040039019A1
公开(公告)日:2004-02-26
Selected anthranilamide pyridinamines of general formula I
1
in which R
1
and R
2
have the meanings that are indicated in the description, as VEGFR-2 and VEGFR-3 inhibitors, their production and use as pharmaceutical agents for treating various diseases that are triggered by persistent angiogenesis, are described.
Intensified synthesis of [3,4-d]triazole-fused chromenes, coumarins, and quinolones
作者:Georg Schwendt、Toma Glasnov
DOI:10.1007/s00706-016-1885-5
日期:2017.1
AbstractEfficient and metal-free synthesis of [3,4-d]triazole-fused chromenes, coumarins, and quinolones has been achieved in an intensified regime using microwave heating. The smooth 1,3-dipolarcycloaddition reaction of heterocyclic nitroalkenes with sodium azide provides a rapid entry into valuable heterocyclic scaffolds with potential biological properties. Graphical abstract
摘要使用微波加热在强化过程中已经实现了[3,4- d ]三唑稠合的色烯,香豆素和喹诺酮的高效无金属合成。杂环硝基烯烃与叠氮化钠的平滑1,3-偶极环加成反应可快速进入有价值的具有潜在生物学特性的杂环支架。 图形概要
Application of differential reactivity towards synthesis of lamellarin and 8-oxoprotoberberine derivatives: Study of photochemical properties of aryl-substituted benzofuran-8-oxoprotoberberines
作者:Sameer Vyasamudri、Ding-Yah Yang
DOI:10.1016/j.tet.2018.01.042
日期:2018.3
A unique differential reactivity between dihydroisoquinolines and 3-nitrocoumarins was observed and was exploited for the efficient construction of lamellarins and their isomeric benzofuran-8-oxoprotoberberine derivatives under acid-catalyzed or base-promoted conditions. Further, these prepared aryl-substituted benzofuran-8-oxoprotoberberine derivatives bearing electron-donating substituents on benzofuran
Abstract C 1-Symmetric chiral ammonium salt catalysts induced a kinetic resolution of racemic α-nitrolactones through an asymmetric ester–amide exchangereaction. The corresponding amides were obtained with high enantioselectivities and high S (= k fast/k slow) values. This reaction system is a useful approach for obtaining carbocyclic quaternary α-nitroamides as chiral building blocks. Publication