3-b]furan-4,9-diones has been developed by N-iodosuccinimide (NIS)-induced enone difunctionalization with 2-hydroxy-1,4-naphthoquinones. This reaction involved sequential Michael addition, intramolecular oxidative cyclization and dehydrogenative aromatization to form new C–C and C–O bonds at the α and β positions of the enones. Various enones survived under the reaction conditions and the corresponding products
perform as an efficient heterogeneous catalyst for the synthesis of useful organoboron compounds. Desired β-borylation products were all obtained in good to excellent yields under mild conditions. This catalyst could be recovered easily and still work effectively in six runs. Notably, asymmetric synthesis of organoboron compounds was accomplished by applying a chiral phosphine ligand. This newly developed
Abstract Thirty semicarbazone and thiosemicarbazone derivatives (2a–w and 4a–g) from chalcones containing furan and thiophene ring were designed and synthesized. They were characterized by IR, 1H NMR, 13C NMR and HRMS. The crystal structure of compound 2r was characterized by single crystal X-ray diffraction. It crystallizes in the monoclinic system with space group P21/c. The insecticidal activity
摘要 设计并合成了来自含有呋喃和噻吩环的查耳酮的30 种缩氨基脲和缩氨基硫脲衍生物(2a - w和4a - g)。它们通过 IR、1 H NMR、13 C NMR 和 HRMS进行表征。化合物2r的晶体结构通过单晶X射线衍射表征。它在空间群为P 2 1 / c的单斜晶系中结晶。合成的化合物对白斑病和菜青虫的杀虫活性进行了筛选使用β-氯氰菊酯作为比较标准。结果表明,它们中的大多数具有显着的杀虫活性。其中,化合物2e-g对L表现出比 β-氯氰菊酯更好的活性。分离和P。油菜。化合物2p还具有比 β-氯氰菊酯更好的抗P活性。油菜。这些化合物的杀虫活性是首次报道。
Synthesis and Selective Inhibitory Activity Against Human COX-1 of Novel 1-(4-Substituted-thiazol-2-yl)-3,5-di(hetero)aryl-pyrazoline Derivatives
作者:Simone Carradori、Daniela Secci、Adriana Bolasco、Celeste De Monte、Matilde Yáñez
DOI:10.1002/ardp.201200249
日期:2012.12
(compounds 5, 6, 13, 16, and 17) displayed promising selectivity against hCOX‐1 in the micromolar range and were shown to have a selectivity index similar or better than the reference drugs (indometacin, diclofenac). The introduction of a phenyl or a 4‐F‐phenyl ring on the C5 associated with a 4‐substituted phenyl or a heteroaryl group on the C3 of (4‐substituted‐thiazol‐2‐yl)pyrazolinederivatives improved
9-diones has been developed via DABCO-catalyzed three-componentreaction of 1,4-naphthoquinone derivatives, α,β-unsaturated ketones and hydrated sodium sulfide. The reaction is initiated by sequential Michaeladditions of sodium sulfide to α,β-unsaturated ketone and of generated anion to 1,4-naphthoquinone derivative, followed by intramolecular oxidative cyclization and aromatization. Various functional groups
通过DABCO催化的1,4-萘醌衍生物,α,β-不饱和酮和水合硫化钠的三组分反应,已经开发了萘并[2,3 - b ]噻吩-4,9-二酮的有效合成方法。通过依次向α,β-不饱和酮中添加硫化钠,并向1,4-萘醌衍生物中生成阴离子,依次进行迈克尔的加成反应,然后进行分子内氧化环化和芳构化,来引发反应。在反应条件下,α,β-不饱和酮中的各种官能团得以存活,并且以高收率产生了萘并[2,3 - b ]噻吩-4,9-二酮。