| abstract |
The invention relates to a compound of formula (IV): or a tautomer or salt thereof, wherein R 1 to R 5 , a, b, X and P 2 are as defined in the specification. Provides a method for preparing intermediates useful for preparing. In one particular embodiment, the invention provides (2S, 4R) -5-biphenyl-4-yl-2-hydroxymethyl-2-methyl-4-[(1H- [1,2,3] triazole- 4-carbonyl) -amino] -pentanoic acid 5-methyl-2-oxo- [1,3] dioxol-4-ylmethyl ester and methods for preparing intermediates useful for preparing tautomers thereof . |