Synthesis of 2-alkylcysteine via substituted thiazoline ester
    8.
    发明申请
    Synthesis of 2-alkylcysteine via substituted thiazoline ester 有权
    通过取代噻唑啉酯合成2-烷基半胱氨酸

    公开(公告)号:US20030236435A1

    公开(公告)日:2003-12-25

    申请号:US10439282

    申请日:2003-05-15

    IPC分类号: C07C323/52

    摘要: Non-natural amino acids such as 2-alkylated amino acids allow for the synthesis of a wider variety of peptidal and non-peptidal pharmaceutically active agents. In one embodiment, the present invention relates to a method of preparing a 2-alkylcysteine comprising condensing cysteine with an aryl nitrile to form a 2-arylthiazoline-4-carboxylic acid, esterifying the 2-arylthiazoline-4-carboxylic acid using a substituted or unsubstituted alcohol group comprising one or more chiral carbons, and alkylating at the 4-position of the thiazoline ring to form a 2-aryl-4-alkyl-thiazoline-4-carboxylic acid ester. The chiral templates present in the thiazoline carboxylic acid ester can provide face selectivity, and consequently desired stereochemistry, during the delivery of an alkyl group to the 4-position of the thiazoline ring. The present invention also discloses a method of preparing a class of iron chelating agents related to desferrithiocin, all of which contain a thiazoline ring. In one embodiment, an aryl nitrile is condensed with cysteine or a 2-alkyl cysteine.

    摘要翻译: 非天然氨基酸例如2-烷基化氨基酸允许合成更多种类的肽和非肽类药物活性剂。 在一个实施方案中,本发明涉及制备2-烷基半胱氨酸的方法,其包括将半胱氨酸与芳基腈缩合以形成2-芳基噻唑啉-4-羧酸,使用取代或取代的2-芳基噻唑啉-4-羧酸酯化2-芳基噻唑啉-4-羧酸 包含一个或多个手性碳的未取代的醇基,在噻唑啉环的4-位烷基化,形成2-芳基-4-烷基 - 噻唑啉-4-羧酸酯。 存在于噻唑啉羧酸酯中的手性模板可以在将烷基递送至噻唑啉环的4-位期间提供面选择性,并因此提供所需的立体化学。 本发明还公开了一种制备与脱铁硫杆菌相关的一类铁螯合剂的方法,所述铁螯合剂全部含有噻唑啉环。 在一个实施方案中,芳基腈与半胱氨酸或2-烷基半胱氨酸缩合。