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Alkylation of the easily accessible methyl ester of L ‐ N a ,3‐dibenzoylhistidine with the aid of trimethyl‐ and triethyloxonium fluoroborate followed by decomposition with water and acid hydrolysis yielded L ‐1 ‐methyl‐ and L ‐1‐ethylhistidine respectively. Comparison with natural L ‐1‐methylhistidine confirmed the structure and optical purity.
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Beyerman et al. (1972) studied this question.
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