Patent ID: 8476432

Claim:
A process for preparing a compound of Formula 1, comprising converting a compound of Formula 4 to a compound of Formula 1: wherein, M is an alkali metal or an alkaline earth metal, R 1 and R 2 are independently C 1 ˜C 5 alkyl or aryl, P 1 and P 2 are independently an alcohol-protecting group; or P 1 and P 2 are cyclized each other to form a 1,3-diol protecting group selected from the group consisting of: wherein R 9 and R 10 are independently C 1 ˜C 10 alkyl or R 9 and R 10 are cyclized each other to form a pentane ring, a hexane ring, or a heptane ring; Z is oxygen or sulfur; and Ph is phenyl, and Het is