Scheme 11:
Synthesis of phthalazinone derivative
47
. Reagents and conditions (i) NaOMe/ MeOH/ reflux; (ii) NEt
3
/ THF / reflux; (iii) N
2
H
4
.H
2
O / reflux; (iv) a) aq. NaOH / THF; b) N
2
H
4
.H
2
O / reflux
