| abstract |
Disclosed is a compound of formula 1, or a pharmaceutically acceptable salt thereof, where R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 7′ , R 8 , R 9 , R 10 , R 11 , R 12 and R 13 are as disclosed herein. Also, disclosed is a process for the preparation of the compound of formula 1, or a pharmaceutically acceptable salt thereof, and intermediates used therein. The compound of formula 1 can be used in the preparation of halichondrin analogs, such as Eribulin; and a process for its preparation from the compound of formula 1 is also disclosed. |