The invention relates to processes for the preparation of a GARFT inhibitor containing a methyl substituted thiophene core having the following structure:
1
wherein each of R
1
and R
2
are independently a hydrogen atom or a moiety that together with the attached CO
2
forms a readily hydrolyzable ester group; from an intermediate of the formula
2
wherein R
3
is a moiety that together with the attached CO
2
forms a readily hydrolyzable ester group;
Pg
1
is an amino protecting group;
R
4
is H;
or Pg
1
can optionally be taken together with R
4
and the nitrogen to which Pg
1
and R
4
are attached to form (i) an imine; or (ii) a fused or bridged bicyclic ring or a spirocyclic ring, wherein said ring is saturated and contains from 5 to 12 carbon atoms in which up to 2 carbon atoms are optionally replaced with a hetero moiety selected from O, S(O)
j
wherein j is an integer from 0 to 2, and —NR
8
—, provided that two O atoms, two S(O)
j
moieties, or an O atom and a S(O)
j
moiety are not attached directly to each other;
R
5
is selected from the group consisting of —C≡C— and —CH═CH—; and
R
8
is independently H or C
1
-C
6
alkyl;
to form the compound of the formula (I) that is optically pure; and to processes for preparing intermediates thereof.
本发明涉及一种制备含有甲基取代
噻吩核心的GARFT
抑制剂的过程,其具有以下结构:
其中R1和R2中的每一个独立地是氢原子或者与连接的
CO2形成易
水解酯基团的基团;从具有以下结构的中间体开始:
其中R3是一个基团,与连接的 一起形成易
水解酯基团;Pg1是
氨基保护基团;R4是H;或者Pg1可以选择与R4及Pg1和R4连接的氮一起形成(i)
亚胺;或者(ii)融合的或者桥接的双环或者螺环,其中所述环是饱和的,含有5至12个碳原子,其中最多有2个碳原子可以选择性地被来自O、S(O)j(其中j是0到2的整数)和—NR8—的杂原子基团替代,前提是两个O原子、两个S(O)j基团,或者一个O原子和一个S(O)j基团不能直接连接在一起;R5选自由—C≡C—和—CH2CH—的基团;R8独立地是H或者C1-C6烷基;形成具有光学纯度的化合物的公式(I);以及制备其中间体的过程。