Acetic Acid → 6-Amino-9-(2-chloroethyl)-2-[(3-pyridylmethyl)amino]-purine

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Reaction Steps

100 mg (0.47 mmol) of 9-(2-chloroethyl)-2,6-diamino-purine (example 12, step A) were dissolved in 10 ml MeOH and 3 g molecular sieves (4 Å), 0.044 ml (0.47 mmol) 3-pyridinecarboxaldehyde and 0.135 ml (2.35 mmol) acetic acid were added. The mixture was stirred for 2 hours at room temperature. 23.6 mg (0.38 mmol) sodium cyano-borohydride were added and stiffing was continued for 4 hours. Additional 0.044 ml (0.47 mmol) 3-pyridinecarboxaldehyde were added and 72 mg sodium cyano-borohydride were added in three portions over three days at room temperature. The solvent was evaporated and the residue was taken up in 50 ml ethyl acetate. The organic layer was washed with sat. aqueous sodium carbonate and brine, dried over Na2SO4 and the solvent was evaporated in vacuo to give 0.254 g of the crude product as yellow oil. The crude product was purified by flash chromatography on silica gel (DCM/MeOH 99.5/0.5→80:20) to give 88 mg of the desired product as white solid.

Provenance & Evidence