The Michaeladdition reactions of indole to 4-arylidene-3-methyl-1-phenyl-5-pyrazolone 1 were investigated in the solid state, by which a series of new compounds, 1-aryl-1-(3-indolyl)-1-(3′-methyl-1′-phenyl-5′-pyrazolon-4′-yl)methanes 2, were easily obtained. This provides a feasible method of preparing novel compounds containing two heterocyclic groups at the same carbon.
Efficient Synthesis of 4,7-Dihydro-1H-oxepino[2,3-c]pyrazoles by Potassium Carbonate Promoted [4+3] Annulation of Crotonate-Derived Sulfur Ylides with Benzylidenepyrazolones
作者:Dian Wang、Xue Wang、Xuange Zhang、Zhiwei Miao
DOI:10.1055/s-0037-1610693
日期:2019.5
crotonate-derived sulfurylides with benzylidenepyrazolones using K2CO3 as the base is reported. The ready availability of starting materials and the simple cyclization procedure make this approach suitable for the preparation of a diverse array of 4,7-dihydro-1H-oxepino[2,3-c]pyrazoles in good to excellent yields. The [4+3] annulation reaction of crotonate-derived sulfurylides with benzylidenepyrazolones
专用于100的庆典日南开大学周年 抽象的 报道了以K 2 CO 3为碱的巴豆酸衍生的硫酰化物与亚苄基吡唑并酮的[4 + 3]环化反应。原料的容易获得和简单的环化程序使该方法适用于以良好或优异的收率制备各种4,7-二氢-1 H-氧代庚并[2,3- c ]吡唑。 报道了以K 2 CO 3为碱的巴豆酸衍生的硫酰化物与亚苄基吡唑并酮的[4 + 3]环化反应。原料的容易获得和简单的环化程序使该方法适用于以良好或优异的收率制备各种4,7-二氢-1 H-氧代庚并[2,3- c ]吡唑。
Efficient enantioselective synthesis of CF2H-containing dispiro [benzo[b]thiophene-pyrrolidine-pyrazole]s via organocatalytic cycloaddition
作者:Yabo Deng、Changyan Yang、Siyu Shi、Yisheng Cao、Pengfei Jia、Yuan Li、Jinqi Huang、Wenjin Yan
DOI:10.1016/j.tet.2023.133580
日期:2023.9
An efficient and practical organocatalytic asymmetric [3 + 2] cycloaddition of difluoromethylated ketoimines and Pyrazolone derivatives catalyzed by quinine-derived thiourea has been disclosed. Under mild conditions, a broad range of CF2H-containing dispiro[benzo[b]thiophene-pyrrolidine-pyrazole]s bearing four adjacent chiral centers including two vicinal spiro quaternary stereocenters were obtained
公开了由奎宁衍生的硫脲催化的二氟甲基化酮亚胺和吡唑啉酮衍生物的有效且实用的有机催化不对称[3+2]环加成反应。在温和条件下,以良好的产率(66-96%产率)获得了多种含有CF 2 H的二螺[苯并[b]噻吩-吡咯烷-吡唑],其具有四个相邻的手性中心,包括两个邻位螺四元立构中心。中等至优异的非对映选择性 (82:18–95:5 dr ) 和对映选择性 (70–98% ee )。
The present invention relates to a cosmetic composition comprising, at least: (i) at least one composite pigment comprising: at least one small particle with a mean particle size of more than 100 nm and less than 1 um, preferably less than 600 nm, and more preferably less than 400 nm, wherein the surface of the small particle is at least in part covered with at least one coating layer comprising at least one inorganic or organic solid UV filter, and optionally at least one coloring agent, preferably at least one coating layer comprising at least one inorganic or organic solid UV filter, and more preferably at least one inorganic solid UV filter; and (ii) at least one plate-type filler with a refractive index of more than 1.6 and less than 2.2 in an amount of more than 1% by weight relative to the total weight of composition.