Synthesis of α-arylthioacetones using TEMPO as the<i>C</i><sub>3</sub>synthon<i>via</i>a reaction cascade of sequential oxidation, skeletal rearrangement and C–S bond formation
作者:Jiao-Xia Zou、Yi Jiang、Shuai Lei、Gao-Feng Yin、Xiao-Ling Hu、Quan-Yi Zhao、Zhen Wang
DOI:10.1039/c9ob00018f
日期:——
pathway to α-sulfenylated carbonyl compounds from commercially available thiols and universally employed TEMPO and its analogues, which act as C3 synthons through skeletal rearrangement under simple and metal-free conditions. Mechanism studies suggest that this reaction involves a consecutive radical oxidation and cation coupling process. TEMPO analogues and thiols serve as oxidants and reductive reagents
Chemoenzymatic synthesis of β-hydroxyl-sulfoxides by a two-step reaction of enzymatic reduction using Pseudomonas monteilii species and sulfoxidation with chiral titanium complexe
A two-step enantioselective synthetic strategy for the preparation of β-hydroxyl-sulfoxides has been described. With the enzymatic reduction of β-ketosulfides using Pseudomonas monteilii ZMU-T04 followed by the asymmetric sulfoxidation with Ti(OiPr)4/(S)-BINOL complexe, a wide range of corresponding β-hydroxyl-sulfoxide derivatives were smoothly obtained with excellent stereoselectivities (up to 99:1
已经描述了用于制备β-羟基亚砜的两步对映体选择性合成策略。通过使用Montesii monteilii ZMU-T04酶促还原β-酮硫醚,然后用Ti(O i Pr)4 /(S)-BINOL络合物进行不对称硫氧化,可以顺利地获得各种相应的β-羟基-亚砜衍生物。出色的立体选择性(高达99:1 dr和> 99%ee)。在控制实验的基础上,还提出了在β-羟基硫醚不对称硫氧化反应中,钛配合物可能存在的螯合物结构。
α-Benzoyloxylation of β-keto sulfides at ambient temperature
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.