A two-step procedure involving cross-metathesis and reductive amination enables easy access to α-methylamines and α,α′-dimethyldiamines from a wide variety of terminal olefins.
Photocatalytic Giese Addition of 1,4-Dihydroquinoxalin-2-ones to Electron-Poor Alkenes Using Visible Light
作者:Jaume Rostoll-Berenguer、Gonzalo Blay、José R. Pedro、Carlos Vila
DOI:10.1021/acs.orglett.0c02953
日期:2020.10.16
The optimized reaction conditions provide a good yield for the radical conjugate addition products (44 examples) with a wide range of structurally different Michael acceptors. A gram scale reaction using sunlight irradiation is also described. Furthermore, several transformations were carried out with the Giese addition products.
使用Ru(bpy)3 Cl 2作为光催化剂和(PhO)2 PO 2 H作为添加剂,实现了1,4-二氢喹喔啉-2-酮与Michael受体的可见光光氧化还原催化偶联。优化的反应条件为具有广泛结构上不同的迈克尔受体的自由基共轭加成产物(44个实例)提供了良好的收率。还描述了使用阳光照射的克级反应。此外,使用Giese添加产品进行了几次转化。
Singlet Oxygen Generation from a Water-Soluble Hypervalent Iodine(V) Reagent AIBX and H<sub>2</sub>O<sub>2</sub>: An Access to Artemisinin
作者:Hui-Jie Shen、Ze-Nan Hu、Chi Zhang
DOI:10.1021/acs.joc.1c00596
日期:2022.3.18
hypervalent iodine(V) reagent developed by our group. The generation of 1O2 was confirmed by the following results: (1) capture of 1O2 with the sodium salt of anthracene-9,10-bis(ethanesulfonate) produced the corresponding endoperoxide and (2) TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) produced by the oxidation of 2,2,6,6-tetramethylpiperidine with 1O2 generated using the AIBX/H2O2 system was detected
在此,我们报告了一种通过用 AIBX处理 H 2 O 2化学生成1 O 2的有效方法,AIBX 是我们小组开发的一种高水溶性、台式稳定、可回收的高价碘 (V) 试剂。1 O 2的产生由以下结果证实:(1)用蒽-9,10-双(乙磺酸)钠盐捕获1 O 2产生相应的内过氧化物和 (2) TEMPO (2,2, 6,6-四甲基-1-哌啶氧基)由使用 AIBX/H 2 O 2生成的1 O 2氧化 2,2,6,6-四甲基哌啶生成通过电子自旋共振光谱检测系统。为了说明这种方法在有机合成中的潜在用途,我们使用 AIBX/H 2 O 2系统进行1 O 2的典型反应:[2 + 2]/[4 + 2] 环加成、申克烯反应和杂原子氧化反应,以高产率提供相应的产物。此外,我们利用该方法合成了抗疟药青蒿素。最后,我们证明了 AIBX 可以在反应后通过包括萃取和去除水的后处理来再生,以获得 AIBX 的前体,然后可以将其重新氧化。
Stereoselective Synthesis of <i>cis</i>-2-Ene-1,4-diones via Aerobic Oxidation of Substituted Furans Catalyzed by ABNO/HNO<sub>3</sub>
We report a highly efficient and selective catalytic system, ABNO (9-azabicyclo-[3.3.1]nonane N-oxyl)/HNO3, for the aerobic oxidation of substituted furans to cis-2-ene-1,4-diones under mild reaction conditions using oxygen as the oxidant. The catalyst system is amenable to various substituted (mon-, di-, and tri-) furans and tolerates diverse functional groups, including cyano, nitro, naphthyl, ketone
我们报告了一种高效和选择性催化体系 ABNO (9-azabicyclo-[3.3.1] nonane N -oxyl)/HNO 3,用于将取代的呋喃有氧氧化为顺式-2-ene-1,4-二酮以氧气为氧化剂,反应条件温和。该催化剂体系适用于各种取代的(单-、二-和三-)呋喃,并耐受多种官能团,包括氰基、硝基、萘基、酮、酯、杂环,甚至甲酰基。基于对照和18个O标记实验,提出了氧化的可能机理。
MEDICINAL PREPARATION
申请人:TORAY INDUSTRIES, INC.
公开号:EP1787661A1
公开(公告)日:2007-05-23
A pharmaceutical preparation has a ligand structure specifically recognizing a target site and an amphiphilic compound having a hydrophobic or amphiphilic group. The pharmaceutical preparation employs an amphiphilic compound of specific structure obtained by introducing a chained hydrophilic group with an appropriate flexibility, and thus becomes a fine particle suited for drug targeting.
The pharmaceutical preparation is expected to give a prolonged pharmacological effect. A particulate preparation exhibiting a remarkable site targeting property can be formed. Further, according to the selection of matrix forming material, the drug releasing property can be controlled.