Synthesis of 2-Amino-1,3-selenazoles by Reaction of N,N-Unsubstituted Selenoureas with a,b-Unsaturated Aldehydes
作者:Mamoru Koketsu、Koichi Kanoh、Hideharu Ishihara
DOI:10.3987/com-06-10893
日期:——
2-Dialkylamino-l,3-selenazoles were obtained by the reaction of N,N-unsubstitutedselenoureas with α,β-unsaturated aldehydes in alcohol in the presence of ferric chloride at room temperature.
2-二烷基氨基-1,3-硒唑是由N,N-未取代的硒脲与α,β-不饱和醛在氯化铁存在下室温反应得到。
A Simple Route to <i>N</i>,<i>N</i>-Disubstituted Selenoureas from N,N-Disubstituted Cyanamides
作者:Horst Hartmann、Dietmar Keil
DOI:10.1055/s-2003-44349
日期:——
N,N-Disubstituted selenoureas 4 can be obtained in satisfactory yields by addition of an acid to a mixture of freshly prepared sodium selenide and N,N-disubstituted cyanamides 5.
This study investigated inhibitory effects of N,N-unsubstituted selenourea derivatives on tyrosinase activity. Three types of N,N-unsubstituted selenoureas derivatives exhibited inhibitory effect on dopa (3,4-dihydroxyphenylalanine) oxidase activity of mushroom tyrosinase. Compound D at a concentration of 200 μM exhibited 55.5% of inhibition on dopa oxidase activity of mushroom tyrosinase. This inhibitory effect was higher than that of kojic acid (39.4%), a well known tyrosinase inhibitor. Moreover, the compound D identified as a noncompetitive inhibitor by Lineweaver–Burk plot analysis. In addition, compound D also inhibited the melanin production in melan-a cells.
本研究探讨了 N,N-未取代硒脲衍生物对酪氨酸酶活性的抑制作用。三种 N,N-未取代硒脲衍生物对蘑菇酪氨酸酶的多巴(3,4-二羟基苯丙氨酸)氧化酶活性有抑制作用。浓度为 200 μ<小>M小>的化合物 D 对蘑菇酪氨酸酶多巴氧化酶活性的抑制率为 55.5%。这种抑制效果高于众所周知的酪氨酸酶抑制剂曲酸(39.4%)。此外,化合物 D 通过 Lineweaver-Burk plot 分析被确定为一种非竞争性抑制剂。此外,化合物 D 还能抑制黑色素-a 细胞中黑色素的生成。
Preparation of N,N-unsubstituted selenoureas and thioureas from cyanamides
Reaction of cyanamides with LiAlHSeH and LiAlHSH in the presence of HCl in diethyl ether provided the corresponding N,N-unsubstituted selenoureas and thioureas in moderate to high yields, respectively.
Preparation of 2-Amino-4<i>H</i>-5,6-dihydro-1,3-selenazin-4-ones by Reaction of N,N-Unsubstituted Selenoureas with α,β-Unsaturated Acid Chlorides
作者:Mamoru Koketsu、Koichi Kanoh、Hideharu Ishihara
DOI:10.1055/s-2007-983820
日期:2007.9
2-Dialkylamino-4 H-5,6-dihydro-1,3-selenazin-4-ones were obtained by the reaction of N,N-unsubstituted selenoureas with α,β-unsaturated acid chlorides at room temperature.