Intramolecular Nucleophilic Acyl Substitution Reactions Mediated by Samarium(II) Iodide: A Convergent Approach to the Preparation of Enantiomerically Enriched 4-Hydroxy Ketones from 3-Iodopropyl Carboxylates
摘要:
Intramolecular nucleophilic acylsubstitution (INAS) reactions of substituted 3-iodopropyl carboxylates have been achieved using samarium(II) iodide (SmI2) in the presence of an iron(III) catalyst. Diverse ester starting materials containing stereogenic centers placed in varying positions on the substrates have been converted to acyclic 4-hydroxy ketone derivatives in good yields using this method. No racemization of stereogenic centers alpha to the carbonyl was observed in any of the reactions examined. Consequently, the method serves as a convenient, high-yield synthesis of functionalized, enantiomerically enriched acyclic ketones possessing stereogenic centers far removed from one another.
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯醛或β-羟基异丁酸中合成维生素E的外消旋或光学活性形式,包括在这种合成过程中的中间体。
Synthesis of vitamin E
申请人:Hoffman-La Roche Inc.
公开号:US04151205A1
公开(公告)日:1979-04-24
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯醛或β-羟基异丁酸中合成光学活性或外消旋形式的维生素E,包括在这个合成中的中间体。
Protected alcohols
申请人:Hoffmann-La Roche Inc.
公开号:US04191842A1
公开(公告)日:1980-03-04
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.