1093065-12-3Relevant articles and documents
INTERMEDIATES FOR PREPARATION OF AN INHIBITOR OF PHOSPHODIESTERASE TYPE 5
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Page/Page column 12, (2010/04/25)
Boronic compounds of formula II and the process for their preparation, wherein Y1 and Y2 are selected from hydroxyl, (C1-C4)alcoxyl and phenoxyl optionally substituted with one or two radicals independently selected from (C1-C4)alkyl and (C1-C4)alcoxyl; or alternatively Y1 and Y2 together with the boron atom can form a cyclic system. Process for the preparation of Sildenafil by reaction of a intermediate of formula II with a intermediate of formula III, wherein X3 is a leaving group and R1 is selected from H and (C1-C4)alkyl.