Diisopropylethylamine → 7-[4-(4-Chloro-phenyl)-piperazin-1-ylmethyl]-10-oxo-1,3,4,9,10,10a-hexahydro-2,4-a,5,9-tetraaza-phenanthrene-2-carboxylic acid tert-butyl ester

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7-Hydroxymethyl-10-oxo-1,3,4,9,10,10a-hexahydro-2,4a,5,9-tetraaza-phenanthrene-2-carboxylic acid tert-butyl ester (22.0 mg, 0.598 mmol) was suspended in propionitrile (1.5 mL) and (cyanomethyl)trimethylphosphonium iodide (174.0 mg, 0.718 mmol) was added followed by N-ethyl-N-isopropylpropan-2-amine (313 ul, 1.794 mmol). To the stirred mixture was then added 1-(4-chlorophenyl)piperazine hydrochloride (139 mg, 0.598 mmol). The reaction was heated to 90° C. with stirring for 16 h. The crude reaction was cooled to room temperature and purified on silica column (24 g, 25% THF in ethyl acetate). The fractions were combined and concentrated to afford 250.9 mg (82%) of the title compound as a brown solid in 80% purity. [M+H] calc'd for C26H33ClN6O3, 513; found, 513.

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