The invention relates to processes for the preparation of a key intermediate in the synthesis of a GARFT inhibitor of formula (Ia) containing a 4-methyl-substituted thiophene core:
1
wherein said key intermediate has the following formula (I):
2
wherein each of R
1
and R
2
are independently a moiety that together with the attached CO
2
forms a readily hydrolyzable ester group;
from a compound of the formula (VI):
3
wherein R
1
is as described above, Pg
1
is an amino protecting group, and Pg
2
is an ether protecting group; wherein said processes are as described in the specification.
该发明涉及一种在合成具有含有4-甲基取代
噻吩核的GARFT
抑制剂的关键中间体的过程,其中所述关键中间体具有以下结构式(I):
其中R1和R2各自独立地是一个与所附
CO2形成易
水解酯基的基团;从具有以下结构式(VI)的化合物中:
其中R1如上所述,Pg1是
氨基保护基团,Pg2是醚基保护基团;其中所述过程如规范中描述。