| abstract |
This invention relates to a compound of Formula I, a method for its preparation and its use in the preparation of a compound of Formula II n n nwherein R 1 , R 2 , R 3 , X and n are as defined in the disclosure. n nThis invention also discloses preparation of compounds of Formula III n n nwherein R 1 , R 2 , R 6 , R 7 , R 8 and n are as defined in the disclosure. n nAlso disclosed are certain intermediates of Formula 4 for the preparation of compounds of Formula I n n nwherein X is N and R 2 , R 3 and n are as defined in the disclosure. |