Acetic Anhydride → (4aS,8aR)-2-(1-Acetyl-piperidin-4-yl)-4-(3,4-diethoxyphenyl)-4a,5,8,8a-tetrahydro-2H-phthalazin-1-one

Participants

Role	Name	HCID	Charge
Reactant	Acetic Anhydride	HCID 7918	—
Reactant	(4aS,8aR)-4-(3,4-Diethoxyphenyl)-2-[1-(toluene-4-sulfonyl)-piperidin-4-yl]-4a,5,8,8a-tetrahydro-2H-phthalazin-1-one	HCID 10175016	—
Product	(4aS,8aR)-2-(1-Acetyl-piperidin-4-yl)-4-(3,4-diethoxyphenyl)-4a,5,8,8a-tetrahydro-2H-phthalazin-1-one	HCID 10216799	—

Prepared from acetic anhydride and starting compound A2 as described for compound 1. Crystallised from diethyl ether. M.p. 148-150° C.