May 23, 2000

A process for the preparation of a compound of formula (I): ##STR1## which comprises cyclization of a compound of formula (II): ##STR2##

2

May 23, 2000

09/360,128

July 23, 1999

544/371   544/383

C07D   487/00   (20060101)   C07D   487/04   (20060101)   C07D   295/26   (20060101)   C07D   231/14   (20060101)   C07D   231/00   (20060101)   C07D   295/00   (20060101)  

This is a division of application Ser. No. 09/869,532, filed on Jun. 6, 1997, now U.S. Pat. No. 5,955,611, entitled "Process For Preparing Sildenafil".

Jun 14, 1996 [GB] 9612514

544/371   544/383  

	6969719 - Polycyclic guanine phosphodiesterase V inhibitors - Owned by Schering Corporation (Kenilworth, NJ) A polycyclic guanine phosphodiesterase V inhibitor having the formula (I.1) or (II.1), with the variables defined herein, which is useful for treating sexual dysfunction and other physiological disorders: ##STR1## A representative example is: ##STR2##
	6821978 - Xanthine phosphodiesterase V inhibitors - Owned by Schering Corporation (Kenilworth, NJ) A xanthine phosphodiesterase V inhibitor having the formula (I), with the variables defined herein, which is especially useful for treating male (erectile) and female sexual dysfunction and other physiological disorders: ##STR1## For example, a representative compound of the invention is: ##STR2##
	7531544 - Xanthine phosphodiesterase V inhibitors - Owned by Schering Corporation (Kenilworth, NJ) A xanthine phosphodiesterase V inhibitor having the formula (I), with the variables defined herein, which is especially useful for treating male (erectile) and female sexual dysfunction and other physiological disorders: ##STR00001## For example, a representative compound of the invention is: ##STR00002##
	7268141 - Xanthine phosphodiesterase V inhibitors - Owned by Schering Corporation (Kenilworth, NJ) A xanthine phosphodiesterase V inhibitor having the formula (I), with the variables defined herein, which is especially useful for treating male (erectile) and female sexual dysfunction and other physiological disorders: ##STR00001## For example, a representative compound of the invention is: ##STR00002##