Synthesis of novelpyrazolopyrrolopyrazines is herein described with the aim to reach new specific PDE-5 inhibitors of potential clinical interest in male erectile dysfunction.
Sil-II’ was confirmed in a set of diverse metathesis reactions including ring-closing metathesis (RCM) and cross-metathesis (CM) of complex polyfunctional substrates of medicinal chemistry interest, including a challenging macrocyclization of the Pacritinib precursor. Compatibility of the new catalyst with various green solvents was checked and metathesis of Sildenafil and Tadalafil-based substrates was successfully
[EN] NOVEL PROCESS FOR THE PREPARATION OF PYRAZOLOPYRIMIDINONES<br/>[FR] NOUVELLE TECHNIQUE DE PREPARATION DE PYRAZOLOPYRIMIDINONES
申请人:PFIZER LTD
公开号:WO2001098303A1
公开(公告)日:2001-12-27
There is provided a process for the production of a compound of general formula (I), wherein A, R?1, R2, R3 and R4¿ have meanings given in the description, which process comprises the dehydrogenation of a compound of general formula (II).
Process for the preparation of pyrazolopyrimidinones
申请人:Pfizer Inc
公开号:US06730786B2
公开(公告)日:2004-05-04
There is provided a process for the production a compound of general formula I:
wherein A, R1, R2, R3 and R4 have meanings given in the description, which process comprises the dehydrogenation of a compound of general formula II,