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    Reactions of 2-Alkylthio-3-methyl-1,4-naphthoquinones with Alkylamines

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    Author
    Kim, Tiffany
    Issue
    urc_student; urc_student
    Date
    2010-01-01 0:00
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/769
    Abstract
    Derivatives of 1,4-naphthoquinone play an important role in various biological processes through reactions with a nucleophile. For example, the anticancer activities in tyrosine phosphatase are due to the reactivity of 1,4-naphthoquinones with a nucleophilic cysteine residue in the active site. Here we study the reactivity of 2-alkylthio-3-methyl-1,4-naphthoquinones against amines, one of the important nucleophiles in the biological environment. We first synthesized 2-alkylthio-3-methyl-1,4-naphthoquinone from the reaction of 2-methyl-1,4-naphthoquinone epoxide with alkanethiol in the presence of N-methylimidazole, a weak base. Then we reacted 2-alkylthio-3-methyl-1,4-naphthoquinone with various alkylamines. The alkylthiols studied were methylthiol, ethylthiol, 1-propanethiol, and 2-propanethiol, and the alkylamines studied were methylamine, ethylamine, and isopropylamine. The product is 2-alkylamino-3-alkylthio-1,4-naphthoquinone through demethylation. In the presence of oxygen, 2-alkylthio-3-methyl-1,4-naphthoquinone epoxide also was efficiently formed. However, in the reactions under argon atmosphere, the formation of epoxide was completely excluded, and only 2-alkylamino-3-alkylthio-1,4-naphthoquinone is detected.
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