were prepared fromβ-ketonitriles via a three-step protocol including the protection of the ketones with methoxyamine, oxidative decyanation, and microwave-assisted deprotection in the final step. This approach provides a novel and efficient access to a wide scope of symmetric and unsymmetric 1,2-diketones using molecular oxygen as the oxidant in the decyanation process. β-ketonitriles - oxygen - oxidative
a wide range of unique polycyclic α,α-difluoro β,β-dihydroxyl para-quinone products were achieved with yields up to 90%. The mechanistic studies revealed that the reaction might undergo tandem multiple electrophilic and nucleophilic substitutions, as well as cleavages of C–O and C–C bonds. This approach not only provides a new method to synthesis of α,α-difluoro ketones, but also affords a series
[EN] QUINOXALINE-BASED LXR MODULATORS<br/>[FR] MODULATEURS DE LXR À BASE DE QUINOXALINE
申请人:WYETH LLC
公开号:WO2010054229A1
公开(公告)日:2010-05-14
Disclosed are quinoxaline-based modulators of Liver X receptors (LXRs) and related methods. The modulators include compounds of formula (I): wherein: each of L1 and L2 is, independently, a bond, -O- or -NH-; R2 is C6-C10 aryl or heteroaryl including 5-10 ring atoms, each of which is (i) substituted with 1 R9, and (ii) optionally further substituted with from 1-4 Re; and each of R4 and R5 is, independently (i) hydrogen; or (ii) halo; or (iii) C1-C6 alkyl or C1-C6 haloalkyl, each of which is optionally substituted with from 1-3 Ra; and R1, R3, R6, R9, Ra and Re are defined herein. In general, these compounds can be used for treating or preventing one or more diseases, disorders, conditions or symptoms mediated by LXRs.
Organobase-catalyzed Mannich reaction of cyclic N-sulfonyl imines and 1,2-diketones: A sustainable approach to 4-(3-arylquinoxalin-2-ylmethyl)sufamidates
作者:Poonam Rani、Meher Prakash、Sampak Samanta
DOI:10.1016/j.tetlet.2023.154490
日期:2023.6
A convenient, eco-friendly, organobase-catalyzed one-pot two-step sequential approach to a fascinating class of various 4-(3-arylquinoxalin-2-ylmethyl)-substituted sulfamidates in good to high yields is reported. This CC/CN bond-forming reaction proceeds via a Mannich reaction of cyclic N-sulfonyl aldimines with 1-aryl-2-alkyl-1,2-diketones catalyzed by triethylamine, followed by the aza-cyclization
报道了一种方便、环保、有机碱催化的一锅两步顺序方法,以良好到高产率生产一类迷人的各种 4-(3-arylquinoxalin-2-ylmethyl)-取代的磺酰胺。这种 C C/C N 键形成反应通过环状N -磺酰醛亚胺与 1-aryl-2-alkyl-1,2-二酮在三乙胺催化下的曼尼希反应进行,然后原位形成 1 的氮杂环化,2-二羰基前体与PEG-400 中的邻二氨基芳烃在室温下作为天然、可重复使用的良性溶剂。此外,这种 100% 碳原子经济的方法对于克级合成是可行的,并且在温和条件下可以容忍各种合成足智多谋的功能。
Recyclable Palladium-Catalyzed Carbonylative Coupling of Aryl Halides and Organoaluminum Compounds with tert-Butyl Isocyanide as CO Equivalent Leading to 1,2-Diketones
An efficient heterogeneous palladium-catalyzed carbonylative coupling of arylhalides and organoaluminum compounds has been developed using tert-butyl isocyanide as CO equivalent. The carbonylation reaction proceeds smoothly in toluene with KOtBu as a base at 100 °C by using 10 mol% of an SBA-15-anchored bidentate phosphine palladium(0) complex [2P-SBA-15-Pd(0)] as the catalyst and provides a general
使用叔丁基异氰化物作为CO当量,开发了芳基卤化物和有机铝化合物的高效非均相钯催化羰基化偶联。使用 10 mol% 的 SBA-15 锚定二齿膦钯 (0) 络合物 [2P-SBA-15-],以 KO t Bu 为碱,在甲苯中于 100 °C 下,羰基化反应顺利进行。 Pd(0)]作为催化剂,为1,2-二酮的组装提供了一种通用且实用的方法,且收率良好。这种多相钯催化剂可以通过简单的离心过程轻松分离和回收,并可重复使用七个以上循环,且催化效率几乎一致。