Compound of general formula I:
1
wherein R
1
, R
2
, R
3
, R
4
, X, Y and R
5
have the meanings given herein which are useful in the curative and prophylactic treatment of a medical condition for which inhibition of a cyclic guanosine 3′,5′-monophosphate phosphodiesterase (e.g. cGMP PDE5) is desired.
Process for the preparation of pyrazolo[4,3-d]pyrimidin-7-one compounds and intermediates thereof
申请人:——
公开号:US20020038024A1
公开(公告)日:2002-03-28
A process is provided for the preparation of compounds of formula (I) herein comprising reacting a compound of formula (II), (III), (IV) or (V) in the presence of
−
OR
3
and a hydroxide trapping agent or in the case of compounds of formula (IV) reacting in the presence of an auxiliary base and a hydroxide trapping agent (i.e.
−
OR
3
is substituted by the auxiliary base), wherein X is a leaving group and R
1
to R
4
are as defined.
Process for the preparation of pyrazolo[4,3-d]pyrimidin-7-one compounds and intermediates thereof
申请人:Pfizer Inc.
公开号:US06809200B2
公开(公告)日:2004-10-26
A process is provide for the preparation of compounds of formula (I) herein
comprising reacting a compound of formula (III), (IV) or (V)
wherein the variables are as defined in the specification. The reaction is conducted in the presence of −OR3 and a hydroxide trapping agent or in the case of compounds of formula (IV) reacting in the presence of an auxiliary base and a hydroxide trapping agent.