Dual reactivity of 1,2-disubstituted dihydro-N-heteroaromatic systems. 9. Alkaline hydrolysis and aromatization of N-actyl partially hydrogenated derivatives of pyrazine and quinoxaline
The effective Cp*IrIII‐catalyzed [4+2] tandem cyclization reaction of β‐keto sulfoxonium ylides and o ‐phenylenediamine has been reported for the first time, furnishing monosubstituted quinoxaline and its derivatives with moderate to excellent yield. This novel protocol exhibits broad substrate scope as well as feasibility for late‐stage modification of drug molecules
首次报道了有效的Cp * Ir III催化β-酮基硫代氧鎓基化物和邻苯二胺的串联[4 + 2]环化反应,提供了中等至优异收率的单取代喹喔啉及其衍生物。该新方案展示了广泛的底物范围以及药物分子后期修饰的可行性
Emission properties of diazines chromophores: Structure-properties relationship
作者:Sylvain Achelle、Françoise Robin-le Guen
DOI:10.1016/j.jphotochem.2017.08.060
日期:2017.11
This article presents the photophysical properties of a series of diazine chromophores. The influence of five parameters has been studied: the presence of a diazine/benzodiazine fragment, the nature of the diazine fragment (1,3-diazine/1,4-diazine), the presence or not of an vinyl linker between diazine ring and phenylene fragments of the π-conjugated bridge, the presence of a phenylene/biphenylene
DMSO/tBuONa/O2-Mediated Efficient Syntheses of Diverse Quinoxalines through α-imino Radicals
作者:Chihong Zhang、Zhen Zhang、Deliang Wang、Wenkun Wang、Bo Jin、Tao Wen、Lihua Ye、Zhong-Ning Chen、Hu Cai
DOI:10.1039/d3cc00086a
日期:——
Herein, we described an efficient method involving the synthesis of diverse quinoxalines using DMSO/tBuONa/O2 system as single-electron oxidants to form α-imino radicals and nitrogen radicals for the direct construction of...
A novel Ir-catalyzed asymmetric hydrogenation protocol for the synthesis of chiral tetrahydroquinoxaline (THQ) derivatives has been developed. By simply adjusting the reaction solvent, bothenantiomers of mono-substituted chiral THQs could be selectively obtained in high yields with excellent enantioselectivities (toluene/dioxane: up to 93% yield and 98% ee (R); EtOH: up to 83% yield and 93% ee (S))
开发了一种用于合成手性四氢喹喔啉 (THQ) 衍生物的新型 Ir 催化不对称氢化方案。通过简单地调整反应溶剂,即可高产率地选择性地获得单取代手性 THQ 的两种对映体,且具有优异的对映选择性(甲苯/二恶烷:收率高达 93%,ee ( R ) 高达 98%;EtOH:收率高达 83%)和 93% ee ( S ))。对于2,3-二取代的手性THQ,获得的顺式氢化产物的收率高达95%,dr为20:1,ee为94%。值得注意的是,该方法也适用于连续流动条件下,产生具有相当收率和对映选择性的克级产品(二恶烷:91% 收率和 93% ee ( R );EtOH:90% 收率和 87% ee ( S ))。与之前报道的 Ir 催化不对称氢化方案不同,该系统表现出显着的改进,因为它不需要额外的添加剂。此外,还进行了全面的机理研究,包括氘标记实验、对照实验、动力学研究和密度泛函理论(DFT)计算,以揭示两种对映体对映选择性的潜在机制。
LOPATINSKAYA, X. YA.;KLYUEV, N. A.;SHEJNKMAN, A. K., XIMIYA GETEROTSIKL. SOEDIN., 1985, N 11, 1551-1556
作者:LOPATINSKAYA, X. YA.、KLYUEV, N. A.、SHEJNKMAN, A. K.