| abstract |
CHEMICAL PROCESS. The present invention relates to a process for the preparation of compounds of formula (I). Where R ^ a ^, R ^ b ^, R ^ 1 ^, R ^ 2 ^, R ^ 3 ^, R ^ 4 ^, R ^ 5 ^, R ^ 6 ^, R ^ 7 ^, R ^ 8 ^ , R ^ 9 ^ and R ^ 10 ^ are defined organic groups, the process comprising reacting a compound of formula (II). With a compound of formula (III). R ^ c ^ CHO (III), and an oxidizing agent. |