| abstract |
Disclosed are salts of a compound of formula 1, as shown below, where R 1 , R 2 , R 3 , R 4 ′ R 5 , R 6 and R 7 are as described herein. Also, disclosed is a process for the preparation of the salts of the compounds of formula 1, and intermediates used therein. The salts of the compound of formula 1 can be useful for preparation of halichondrin analogs such as eribulin. |