7-(heteroaryl-amino-6,7,8,9-tetrahydropyrido[1,2-a]indol acetic acid derivatives and their use as prostaglandin d2 receptor modulators

摘要

The present invention relates to 7-(heteroaryl-amino)-6,7,8,9-tetrahydropyrido[1,2-a]indol acetic acid derivatives of the formula (I), wherein R1, R2, R3 and R4 are as described in the description and their use as prostaglandin receptor modulators, most particularly as prostaglandin D2 receptor modulators, in the treatment of various prostaglandin-mediated diseases and disorders, to pharmaceutical compositions containing these compounds and to processes for their preparation.