Copper-catalyzed asymmetric sulfoxidation of aryl benzyl and aryl alkyl sulfides, using aqueous hydrogen peroxide as the oxidant, has been investigated. A relationship between the steric effects of the sulfide substituents and the enantioselectivity of the oxidation has been observed, with up to 93% ee for 2-naphthylmethyl phenyl sulfoxide, in modest yield in this instance (up to 30%). The influence
Enantioselective Sulfoxidation Catalyzed by a Bisguanidinium Diphosphatobisperoxotungstate Ion Pair
作者:Xinyi Ye、Adhitya Mangala Putra Moeljadi、Kek Foo Chin、Hajime Hirao、Lili Zong、Choon-Hong Tan
DOI:10.1002/anie.201601574
日期:2016.6.13
The first enantioselective tungstate‐catalyzed oxidation reaction is presented. High enantioselectivities were achieved for a variety of drug‐like phenyl and heterocyclic sulfides under mild conditions with H2O2, a cheap and environmentally friendly oxidant. Synthetic utility was demonstrated through the preparation of (S)‐Lansoprazole, a commercial proton‐pump inhibitor. The active ion‐pair catalyst
提出了第一个对映选择性钨酸盐催化的氧化反应。在温和的条件下,使用廉价且环保的氧化剂H 2 O 2可实现多种药物样的苯基和杂环硫化物的高对映选择性。通过制备商业化的质子泵抑制剂(S)-兰索拉唑证明了其合成用途。使用拉曼光谱法和计算研究,活性离子对催化剂被鉴定为双胍双磷酸双过氧钨酸盐。