Sodium triacetoxyborohydride → 4-(2-Chloro-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl)-3-isopropylpiperazin-2-one

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Reaction Steps

A mixture of 2-chloro-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (212 mg, 0.75 mmol), 3-isopropylpiperazin-2-one (128 mg, 0.90 mmol) and powdered 4 Å molecular sieves in DCE (18 mL) were stirred at RT. After 4 h, sodium triacetoxyborohydride (318 mg, 1.50 mmol) was added and the resulting mixture stirred for a further 17 h. The reaction mixture was filtered through Celite®, loaded onto an Isolute® SCX-2 cartridge, washed with MeOH then the desired product eluted with 2 M NH3/MeOH in DCM. Trituration of the resulting residue with EtOAc gave 4-(2-Chloro-9-methyl-6-morpholin-4-yl-9H-purin-8-ylmethyl)-3-isopropylpiperazin-2-one as a yellow oil (198 mg, 65%). LCMS (Method H): RT=2.82 min, [M+H]+ 408.4

Provenance & Evidence