N,N,N',N'-Tetramethylethylenediamine → HCID 86690206, compound

Participants

Reaction Steps

To a solution of olanzapine (5.0 g, 16 mmol) in tetrahydrofuran (50 mL) at −78° C. was added tetramethylethylenediamine (2.4 mL, 16 mmol), followed by 2M n-BuLi in hexanes (8.0 mL, 16 mmol) over 5 min. The reaction mixture was stirred for 15 min and then chloromethyl chloroformate (2.1 mL, 24 mmol) added and the reaction mixture stirred a further 30 min. The reaction mixture was then warmed to room temperature, stirred for 1 h and quenched with water (50 mL). This mixture was diluted with brine (50 mL) and extracted with ethyl acetate (50 mL). The organic phase was dried over MgSO4, evaporated and the residue further purified by column chromatography on silica eluting with 0.2:1:1 methanol/dichloromethane/ethyl acetate to give chloromethyl 2-methyl-4-(4-methylpiperazin-1-yl)-10H-benzo[b]thieno[2,3-e][1,4]diazepine-10-carboxylate [C] (5.6 g, ˜50% pure by 1H NMR and LCMS). This was used directly in the next reaction without further purification.

Provenance & Evidence