nucleophiles, isocyanates selectively couple with selenols. Selenocarbamates exhibited thiol-peroxidase-like properties, enabling the reduction of hydrogen peroxide at the expense of thiols, which are converted into the corresponding disulfides. A series of control experiments suggested that the catalytic mechanism proceeds through a pathway, involving a H2O2-promoted transcarbamoylation reaction leading
硒醇在温和的无催化剂条件下与异氰酸酯反应,以良好的收率和高选择性生成硒代氨基甲酸酯,而不是潜在的竞争亲核加成。该方法能够结合多种官能团,从而提供对广泛的密集官能化硒代氨基甲酸酯的访问。在竞争性以杂原子为中心的亲核试剂存在下,异氰酸酯选择性地与硒醇偶联。硒氨基甲酸酯表现出类似硫醇过氧化物酶的特性,能够以硫醇为代价还原过氧化氢,硫醇被转化为相应的二硫化物。一系列控制实验表明催化机制通过一个途径进行,涉及 H 2 O 2- 促进氨基甲酰化反应,产生硫代氨基甲酸酯,同时释放具有催化活性的硒酸阴离子。通过过氧化物驱动的硫醇 - 硒醇交换,硒代氨基甲酸酯表现为具有硫醇过氧化物酶样活性的硒酸阴离子的等价物。
PREPARATION OF DISELENIDES BY THE OXIDATION OF SELENOLS USING TRICHLOROISOCYANURIC ACID
作者:Ping Zhong、Meng-Ping Guo
DOI:10.1081/scc-100104062
日期:2001.1
Selenols are readily oxidized to diselenides by a solution of pyridine, water, benzoic acid, and trichloroisocyanuric acid in acetonitrile and methylene chloride.
硒醇很容易被吡啶、水、苯甲酸和三氯异氰脲酸的乙腈和二氯甲烷溶液氧化成二硒化物。
A Scalable Process for the Synthesis of 1,2-Dialkyldiselanes and 1-Alkaneselenols
作者:John P. Cooksey、Philip J. Kocieński、A. John Blacker
DOI:10.1021/acs.oprd.9b00380
日期:2019.11.15
telescoped process for the synthesis of 1-alkaneselenols entails (1) the rapid formation of potassium selenocyanate from potassium cyanide and selenium in methanol, (2) the nucleophilic substitution of bromoalkanes or alkyl tosylates with potassium selenocyanate, (3) the mild base-catalyzed conversion of the resultant 1-alkaneselenocyanates to 1,2-dialkyldiselanes (the Krief reaction), and (4) the reduction
Reactions of selenium with imines (RR1CNR2) of aldehydes and ketones in the presence of carbon monoxide, water and triethylamine lead to reductive selenation, on aerobic work-up, to afford symmetrical diselenides (RR1CHSe)2 in good to excellent yields. The proposed mechanism suggests that both in situ generated carbonyl selenide (SeCO) and hydrogen selenide (H2Se) are involved in the reaction.