Endothelin receptor antagonists

PCT No. PCT/EP94/03418 Sec. 371 Date Apr. 30, 1996 Sec. 102(e) Date Apr. 30, 1996 PCT Filed Oct. 17, 1994 PCT Pub. No. WO95/12611 PCT Pub. Date May 11, 1995The present invention provides novel compounds represented by the general formula I: (I) wherein R1 is a straight or branched lower alkyl, a cycloalkyl-lower alkyl, an aryl-lower alkyl, a cycloalkyl, an aryl an aryl-cycloalkyl, lower alkoxy, an aryloxy, or a heteroaryl; R2 is hydrogen, a straight or branched lower alkyl, a cycloalkyl, or a cycloalkyl-lower alkyl; R3 and R3' are each the same or different and each is hydrogen atom, a straight or branched lower alkyl, a cycloalkyl, an aryl-lower alkyl, an aryl, or a heteroaryl; or R3 and R3' together form a ring structure; R3'' is hydrogen, lower alkyl or an aryl; or R2 and R3'' together form a lower alkylene group -(CH2)n- wherein n is an integer of 1, 2 or 3; or R2 and R3'' together form a group represented by the formula: -(CH2)p-Ar- or -Ar-(CH2)p-, respectively, wherein p is zero or an integer of 1 or 2, and Ar is an arylene or heteroarylene; C(=X) is C(=O), C(=S), C(=NH), C(=N-lower alkyl); C=NH-OH, or CH2; Y is a direct bond, -NH-, a lower alkyl-N