通过异丙醇钠在异丙醇中的作用,使芳基二苯甲基二硫化物消除槟榔酚,得到硫代二苯甲酮。硫代二苯甲酮的产率随二苯甲基和芳基部分上的取代基的性质而变化,在吸引电子的取代基的情况下更高。在20二阶消除速率常数°允许一个来估计近似的哈米特ρ的4值对二苯基甲基取代基和2的用于芳基的取代基。对于α,在30°处测得的动力学同位素效应k H / k D为6·1-联苯基-4-基苄基4-甲苯基二硫化物。在这种材料上进行的exchange交换实验表明,未改变的材料没有明显的tri摄入量。
Owing to the high synthetic value of deuteration in the pharmaceutical industry, we describe herein the conversions of a range of aromatic ketones to deuterium-labeled products in good to excellent yields.
Practical Method for Reductive Deuteration of Ketones with Magnesium and D<sub>2</sub>O
作者:Nengbo Zhu、Min Su、Wen-Ming Wan、Yajun Li、Hongli Bao
DOI:10.1021/acs.orglett.9b04536
日期:2020.2.7
α-Deuterated alcohols have important applications in pharmaceuticals and mechanism studies. Here, we report a new and practical strategy for the reductive deuteration of ketones using a Mg/BrCH2CH2Br/D2O system, which affords α-deuterated alcohols in good yields and with almost quantitative incorporation of deuterium. The synthetic value of this method has been demonstrated by the easy access to deuterated
Reductive Deuteration of Ketones with Magnesium and D2O for the Synthesis of α-Deutero-o-methyl-benzhydrol
作者:Nengbo Zhu
DOI:10.15227/orgsyn.098.0051
日期:——
Thiocarbonyl elimination from sulphenic systems. Part II. Elimination of benzenethiol from substituted diphenylmethyl phenyl disulphides
作者:U. Miotti、U. Tonellato、A. Ceccon
DOI:10.1039/j29700000325
日期:——
Aryl diphenylmethyldisulphides undergo elimination of arenethiol to give thiobenzophenones by the action of sodium isopropoxide in isopropyl alcohol. The yield of thiobenzophenones varies with the nature of the substituents both on the diphenylmethyl and on the aryl moiety, being higher in the case of electron-attracting substituents. The second-order elimination rate constants at 20° allow one to
通过异丙醇钠在异丙醇中的作用,使芳基二苯甲基二硫化物消除槟榔酚,得到硫代二苯甲酮。硫代二苯甲酮的产率随二苯甲基和芳基部分上的取代基的性质而变化,在吸引电子的取代基的情况下更高。在20二阶消除速率常数°允许一个来估计近似的哈米特ρ的4值对二苯基甲基取代基和2的用于芳基的取代基。对于α,在30°处测得的动力学同位素效应k H / k D为6·1-联苯基-4-基苄基4-甲苯基二硫化物。在这种材料上进行的exchange交换实验表明,未改变的材料没有明显的tri摄入量。
Catalyst-free photo-reductions of aromatic olefins and carbonyl compounds
作者:Jieliang Wu、Boyu Yan、Jiangtao Meng、Enqin Yang、Xiushen Ye、Qiuli Yao
DOI:10.1039/d2ob01353c
日期:——
We describe herein a catalyst-free, traditional reductant-free strategy for the direct photoinduced hydrogenation or deuteration of aromatic olefins, ketones, and aldehydes with simple bases as the only additives. A broad range of substrates were demonstrated with high yields and deuterium incorporations. Mechanistic experiments indicate a radical mechanism.