Patent ID: 11866428
Assignee: ASTEX THERAPEUTICS LIMITED
Field: Pharmaceuticals (Chemistry)
Classification: CPC C  A | IPC A  C

Claim 3:
4. The protected form of formula (I) as defined in claim 1, wherein:
(i) R3a and R3b are independently selected from hydrogen, C1-6 alkyl, —C(═O)NH(2-q)(C1-6 alkyl)q, —(CH2)s-(3-12 membered heterocyclyl), —(CH2)s—C3-12 carbocyclyl, —C(═O)-(3-12 membered heterocyclyl), and —C(═O)—C3-12 carbocyclyl wherein said C1-6 alkyl, heterocyclyl and carbocyclyl groups may be optionally substituted by one or more Rb groups; or
(ii) R3b is hydrogen, and R3a is
—CH2-(6 membered saturated heterocyclyl), such as —CH2-piperidinyl, —CH2-piperazinyl or —CH2-morpholinyl, wherein said heterocyclyl group may be optionally substituted by one or more Rbgroups (e.g. ═O, C1-6 alkyl (such as methyl or ethyl) or —(CRxRY)s—O—Rz (e.g. —CH2OCH3)); or
(iii) R3b is hydrogen, and R3a is —CH2-(4-morpholinyl) optionally substituted by one or more Rbgroups (e.g. C1-6 alkyl, such as methyl).