Intermediates for the preparation of certain triazolopyrimidines as P2T antagonists

摘要

The invention provides a compound of formula (V): <CHEM> where: R<1> is C3-5 alkyl optionally substituted by one or more halogen atoms; R<3> and R<4> are both hydroxy; or are protected derivatives thereof or R<3> and R<4> together form a bond in the 5-membered ring. R is XOH, where X is CH2, OCH2CH2 or a bond, or is a protected derivative thereof, or is OCH2CO2R', where R' is C1-6 alkyl or benzyl; and L is a leaving group such as halogen or SR; and processes for their preparation