Fluorium-Initiated Dealkylative Cyanation of Thioethers to Thiocyanates
作者:Yang Chen、Hongyi Qi、Ning Chen、Demin Ren、Jiaxi Xu、Zhanhui Yang
DOI:10.1021/acs.joc.9b00965
日期:2019.7.19
Thioethers are converted to thiocyanates via fluorium-initiated dealkylative cyanation. Selectfluor is used as the oxidant, and trimethylsilyl cyanide is used as the cyanation reagent. The well-streamlined procedure is user-friendly, operationally simple, and step-economical. The current mechanistic studies show that the sulfur radical cation and cyano radical are both involved. They combine to deliver
An organic–inorganic hybrid supramolecular framework material based on a [P<sub>2</sub>W<sub>18</sub>O<sub>62</sub>]<sup>6−</sup>cluster and Yb & Na complexes of pyridine-2,6-dicarboxylic acid: a catalyst for selective oxidation of sulfides in water with H<sub>2</sub>O<sub>2</sub>
作者:Pulikanti Guruprasad Reddy、Narsimha Mamidi、Chullikkattil P. Pradeep
DOI:10.1039/c5ce02546j
日期:——
rare-earth-containing polyoxometalate (RECP) hybrid, (Yb (PDCH2)2(PDCH))·Na(H2O)2·(Na(PDCH)(H2O)2)}2[P2W18O62]·14H2O (1), based on [P2W18O62]6− cluster anions and cationic Yb & Na complex units of pyridine-2,6-dicarboxylic acid (PDCH2) has been synthesized under normal reaction conditions, which exhibited a supramolecular 3-D framework structure in the crystal lattice. Hybrid 1 acts as a green catalyst
含稀土的多金属氧酸盐(RECP)杂种,(Yb(PDCH 2)2(PDCH))·Na(H 2 O)2 ·(Na(PDCH)(H 2 O)2)} 2 [P 2 W 18 O 62 ]·14H 2 O(1)基于[P 2 W 18 O 62 ] 6-簇阴离子和吡啶-2,6-二羧酸(PDCH 2)的阳离子Yb和Na络合单元已合成在正常反应条件下,其在晶格中表现出超分子3-D骨架结构。混合动力1用作绿色催化剂,以H 2 O 2为试剂选择性氧化水中的硫化物。
Palladium-Catalyzed Cyanation of Aryl Sulfonium Salts
作者:Mengna Liu、Benqiang Cui、Chuntao Zhong、Yanhui Shi、Yanfeng Dang、Changsheng Cao
DOI:10.1021/acs.orglett.3c00829
日期:2023.6.9
dimethylsulfonium salts using cheap, nontoxic, and bench-stable K4[Fe(CN)6]·3H2O as the cyanating reagent has been developed. The reactions proceeded well under base-free conditions with various sulfonium salts and provided aryl nitrile with yields of up to 92%. Aryl sulfides can be transformed to aryl nitriles directly via a one-pot process, and the protocol is scalable. Density functional theory calculations
使用廉价、无毒且实验室稳定的 K 4 [Fe(CN) 6 ]·3H 2 O 作为氰化试剂,开发了钯催化的芳基二甲基锍盐氰化反应。该反应在无碱条件下使用各种硫鎓盐进行得很好,并以高达 92% 的产率提供芳基腈。芳基硫化物可以通过一锅法直接转化为芳基腈,并且该协议是可扩展的。进行密度泛函理论计算以研究涉及氧化加成、配体交换、还原消除和再生以产生产物的催化循环的反应机理。
4-ACYLAMINOPYRAZOLE DERIVATIVES
申请人:Sankyo Company, Limited
公开号:EP1329160A2
公开(公告)日:2003-07-23
A 4-acylaminopyrazole derivative represented by the following general formula:
wherein R1 is a hydrogen atom, an optionally substituted C1-C16 alkyl group or the like,
R2 and R3 are independently a hydrogen atom, a halogen atom, an optionally substituted C1-C6 alkyl group or the like,
R4 is a hydrogen atom, a C1-C6 alkyl group or a cyano group,
Z is an oxygen atom or a sulfur atom,
Ar is an optionally substituted C6-C14 aryl group or an optionally substituted 5-6 membered unsaturated heterocyclic group,
B is a hydrogen atom, a halogen atom, an optionally substituted C1-C16 alkyl group or the like.
由以下通式代表的 4-酰氨基吡唑衍生物:
其中 R1 是氢原子、任选取代的 C1-C16 烷基或类似基团、
R2 和 R3 独立地为氢原子、卤素原子、任选取代的 C1-C6 烷基或类似基团、
R4 是氢原子、C1-C6 烷基或氰基、
Z 是氧原子或硫原子、
Ar 是任选取代的 C6-C14 芳基或任选取代的 5-6 位元不饱和杂环基团、
B 是氢原子、卤素原子、任选取代的 C1-C16 烷基或类似基团。
Palladium-catalyzed carbonylative transformation of phenols via in-situ triflyl exchangement
Phenols are attractive starting materials due to their ready availability. Herein, we developed a novel method on palladium-catalyzed alkoxycarbonylation of phenols. By using commercially available Pd(OAc)(2) and PtBu center dot HBF4 as the catalyst system and aryl triflates as triflyl source to activate the other phenol, various carboxylic acid esters were prepared in moderate to good yields via Tf exchange and then O-Tf bond cleavage. Notably, phenols generated from aryl triflates after Tf transfer or other additional aliphatic alcohols can all be employed as nucleophiles to synthesize the corresponding esters. (C) 2020 Elsevier Inc. All rights reserved.