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With tert.-butylnitrite; copper dichloride; In acetonitrile; at 20 - 60℃;Inert atmosphere;
Step A. Preparation of 2-chloro-5-iodopyrimidine [00166] To a stirring solution of <strong>[1445-39-2]5-iodopyrimidin-2-amine</strong> (2.21 g, 10.0 mmol) in CH3CN (20 ml) at room temperature under argon was added copper (II) chloride (2.02 g, 15 mmol) and tert-butyi nitrite (1.55 g, 15 mmol). The reaction mixture was placed in a preheated oil bath (60 0C) under Argon. The reaction mixture was cooled to room temperature and 20 ml of ether was added. The resulting insoluble material was filtered and the filtrate was concentrated. The crude product was dissolved in a small amount of DCM (~2 ml) and loaded onto an 80 g ISCO silica gel column which was eluted with a 20 min gradient from 0% to 100% EtOAc/Hexanes. 778 mg (31%) of 2-chloro-5-iodopyrimidine was obtained as an off- white solid. 1H NMR (400 MHz, CDCl3) delta ppm 8.79 (s, 2 H).
28%
With sodium hydroxide; sodium nitrate; In hydrogenchloride; water;
(d) A suspension of <strong>[1445-39-2]2-amino-5-iodopyrimidine</strong> (40 g) in concentrated hydrochloric acid (150 ml) was treated dropwise at a temperature of 25 to 30 C. with a solution of sodium nitrate (40 g) in water (70 ml). The reaction mixture was stirred at a temperature of 25 to 30 C. for a further 2 hr and then neutralised by the addition of aqueous 20% sodium hydroxide, the temperature of the reaction mixture being maintained at 10 to 20 C. during the neutralisation by external cooling. The neutralised reaction mixture was filtered to remove solids and the solids were washed several times with chloroform. The filtrate was extracted with chloroform and the combined chloroform washings and extracts were dried and the chloroform was removed by distillation under reduced pressure to give crude 2-chloro-5-iodopyrimidine as a pale brown solid (12 g, 28%) with m.p. 125 C. (Reference m.p. 129-130 C. J. Chem. Soc. (C), 1971, 1889).
1.7 g
With tert.-butylnitrite; copper dichloride; In acetonitrile; at 70℃;
To a solution of <strong>[1445-39-2]5-iodopyrimidin-2-amine</strong> (10.0 g, 0.045 mol) in acetonitrile (150 mL) was added CuCl2 (11.57 g, 0.067 mol) and teri-butyl nitrite (6.99 g, 0.067 mol). The reaction mass was heated at 70C for 5-6 h. The reaction mass was diluted with ether and the solid obtained was filtered off. The obtained product was purified with column chromatography on silica gel eluting with DCM to afford 1.700 g of the desired product
5-iodo-N-[(1R)-1,2,3,4-tetrahydronaphthalen-1-yl]pyrimidin-2-amine[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
With dicyclohexylethylamine; In 1-methyl-pyrrolidin-2-one; at 160℃; for 1.5h;Microwave irradiation;
2.50 g (10.3 mmol) of 2-chloro-5-iodopyrimidine, 1.99 g (13.5 mmol) of (1R)-1,2,3,4-tetrahydronaphthalen-1-amine and 4.34 g (20.7 mmol) of dicyclohexylethylamine in 4.0 mL of 1-methyl-2-pyrrolidone are heated to 160 C. in a closed cuvette in the microwave for 90 minutes (Biotage Initiator, http://www.biotage.com/product-page/biotage-initiator). The crude mixture thus obtained is applied to silica gel and purified by column chromatography with heptane/ethyl acetate as the eluent. Concentration affords 4.00 g of 5-iodo-N-[(1R)-1,2,3,4-tetrahydronaphthalen-1-yl]pyrimidin-2-amine (in waxy form) (98% yield at 90% purity).
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