Hydrazine → 2-[2-(N-tert-butoxycarbonylamino)ethyl]-5-(p-toluenesulfonyl oxy)isoquino[8,7,6cd]indazole-6(2H)-one

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Reaction Steps

(2-N-tert-butoxycarbonylaminoethyl)hydrazine is prepared by reaction of N-t-butoxycarbonyl-2-chloroethylamine with hydrazine following a procedure adapted from J. Med. Chem. 7, 493, (1964). Under a nitrogen atmosphere a solution of (2-N-tert-butoxycarbonylaminoethyl)hydrazine (9.2 g) in anhydrous THF (10 mL) is added during 30' to the stirred 9:1 mixture of 9-fluoro-6-(p-toluenesulfonyloxy)benzo[g]isoquinoline-5,10-dione and 9-chloro-6-(p-toluenesulfonyloxy)benzo [g]isoquinoline-5,10-dione of Preparative Example 10b (3.0 g) in THF (25 mL) containing N,N-diisopropylethylamine (1.38 mL). A slightly exothermic reaction ensues, and the reaction temperature increases from 21° C. to 24° C. After stirring for one hour at room temperature the obtained precipitate is recovered by suction, washed with THF/n-hexane 1/1 (15 mL) and dried at 40° C. under vacuum, to give 2-[2-(N-tert-butoxycarbonylamino)ethyl]-5-(p-toluenesulfonyloxy)isoquino [8,7,6-cd]indazole-6(2H)-one (1.33 g).

Provenance & Evidence