CPC C07D 209/12 (2013.01) [C07D 401/12 (2013.01); C07D 405/12 (2013.01); C07D 409/12 (2013.01); C07D 475/04 (2013.01); C07D 491/113 (2013.01); C07D 491/20 (2013.01); C07D 495/04 (2013.01); C07D 495/10 (2013.01); C07D 497/10 (2013.01); C07D 498/10 (2013.01); C07D 519/00 (2013.01); C07F 7/1804 (2013.01)] | 21 Claims |
1. A compound of formula (I):
![]() or a pharmaceutically acceptable salt thereof, wherein
R1is or C1-C7alkyl or H; and
ring A
![]() wherein * denotes the attachment points of ring A to the compound of formula (I), and wherein
R3 is —OSi(C1-C6 alkyl)3, —OC(O)C1-C6 alkyl, —OC(O)C2-C6 alkenyl, —OC(O)C3-C10 cycloalkyl, —OC(O)phenyl, —OC(O)-5- to 7-membered heteroaryl, wherein each hydrogen atom in C1-C6 alkyl, C2-C6 alkenyl, C3-C10 cycloalkyl, phenyl, and 5- to 7-membered heteroaryl is optionally substituted by halogen, C1-C6 alkyl, C1-C3 alkoxy, nitro, —N(C1-C3 alkyl)2, C1-C3 haloalkyl, cyano, phenyl, phenoxy or —O(CH2)pOCH3; and
p is 2, 3, or 4.
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