Phosphorus pentachloride → N-[(S)-2-methylhexanoyl]-alpha-L-glutamyl-5-aminopyridine-2-carbonitrile

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반응 단계

To prepare this compound, a solution of 1.2 g (0.008 mol) of (S)-2-methylhexanoyl chloride (prepared by reacting phosphorus pentachloride with (S)-2-methylhexanoic acid, itself obtained by the method described in J. Biol. Chem. 1926, 70, 211; ibid, 1932, 98, 1 and Chem. Pharm. Bull. 1979, 27, 747) in 30 cm3 of anhydrous tetrahydrofuran is added dropwise to a solution of 1 g (0.004 mol) of alpha-L-glutamyl-5-aminopyridine-2-carbonitrile (prepared according to J. Med. Chem. 1973, 16, 163) and 3.4 g (0.04 mol) of NaHCO3 in 30 cm3 of water. After stirring for 15 minutes at 20° C., the tetrahydrofuran is removed under vacuum and the remaining aqueous solution is acidified to pH 2-3 with a 6N solution of HCl, affording a precipitate of 1 g of N-[(S)-2-methylhexanoyl]-alpha-L-glutamyl-5-aminopyridine-2-carbonitrile (yield 69%, melting point 146° C., in the amorphous state) after filtration and trituration in hexane.

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