PROCESS AND INTERMEDIATE FOR THE PREPARATION OF 2-HYDROXY-3-SULFIDO-3-PHENYL PROPANOIC ACIDS

摘要

This invention relates to intermediate compounds of formula (VI), wherein: R1 is (L)a-(CH2)b-(T)c-B; a is 0 or 1; b is 3 to 14; c is 0 or 1; L and T are independently sulfur, oxygen, CH=CH, C=C, or CH2; B is H, C1-4alkyl, ethynyl, trifluoromethyl, isopropenyl, furanyl, thienyl, cyclohexyl or phenyl unsubstituted or monosubstituted by Br, Cl, CF3, C1-4alkoxy, C1-4alkyl, methylthio or trifluoromethylthio; R2 and A are independently selected from H, CF3, C1-4alkyl, C1-4alkoxy, F, Cl, Br, I, OH, NO2 or NH2; or, when R1 and A are H, R2 is (L)a-(CH2)b-(T)c-B wherein a, b, c, L, T and B are as defined above; and M is H, Li, Na, K, NH4 or an organic ammonium cation, and their use in a process for preparing leukotriene antagonists.