1-Amino-4-methylpiperazine → 4-(9'-cyclopentyl-5'-methyl-6'-oxo-5',6',8',9'-tetrahydrospiro[cyclobutane-1,7'-pyrimido[4,5-b][1,4]diazepine]-2'-ylamino)-3-methoxy-N-(4-methylpiperazin-1-yl)benzamide

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4-(9′-Cyclopentyl-5′-methyl-6′-oxo-5′,6′,8′,9′-tetrahydrospiro[cyclobutane-1,7′-pyrimido[4,5-b][1,4]diazepine]-2′-ylamino)-3-methoxybenzoic acid (Intermediate 7) (15 mg, 0.033 mmol, 1 eq), DIPEA (12 μl, 0.066 mmol, 2 eq) and TBTU (12 mg, 0.036 mmol, 1.1 eq) were added to 0.5 mL DMF and the resulting solution stirred at rt for 5 min before the addition of 1-amino-4-methylpiperazine (5 mg) and DIPEA (13 μL). The RM was then stirred at rt for 3 hours before purifying by preparative RP-HPLC-MS (Preparative—2) to provide 4-(9′-cyclopentyl-5′-methyl-6′-oxo-5′,6′,8′,9′-tetrahydrospiro[cyclobutane-1,7′-pyrimido[4,5-b][1,4]diazepine]-2′-ylamino)-3-methoxy-N-(4-methylpiperazin-1-yl)benzamide.

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