Synthesis of benzo[d]-1,2-thiazole-1,1-dioxide derivatives via directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides
摘要:
A novel synthesis of 7-substituted benzo[d]-1,2-thiazole-1,l-dioxides 4 is presented including directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides 1 - 3, aryne-mediated cyclization and subsequent quenching of aryllithium intermediates with various electrophiles. A proposed mechanism is rationalized by some control experiments. (C) 1997 Elsevier Science Ltd.
Synthesis of benzo[d]-1,2-thiazole-1,1-dioxide derivatives via directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides
摘要:
A novel synthesis of 7-substituted benzo[d]-1,2-thiazole-1,l-dioxides 4 is presented including directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides 1 - 3, aryne-mediated cyclization and subsequent quenching of aryllithium intermediates with various electrophiles. A proposed mechanism is rationalized by some control experiments. (C) 1997 Elsevier Science Ltd.
The invention relates to compounds of formula I
wherein R
1
, R
2
, R
4
, R
a
, R
b
, R
c
, R
e
, A*, W
1
, W
2
and W
3
are as defined in claim
16
, for the treatment of CXCR3 related diseases.
Isoxazole Derivatives as FXR Agonists and Methods of Use Thereof
申请人:Enanta Pharmaceuticals, Inc.
公开号:US20170334894A1
公开(公告)日:2017-11-23
The present invention provides compounds of Formula I:
and pharmaceutically acceptable salts thereof, pharmaceutical compositions comprising these compounds and methods of using these compounds to treat or prevent a disease or disorder mediated as FXR modulators. Specifically, the present invention relates to isoxazole derivatives useful as agonists for FXR, and methods for their preparation and use.
Synthesis of benzo[d]-1,2-thiazole-1,1-dioxide derivatives via directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides
A novel synthesis of 7-substituted benzo[d]-1,2-thiazole-1,l-dioxides 4 is presented including directed lithiation of 2,2-dimethyl-N-(phenylsulfonyl)-propanamides 1 - 3, aryne-mediated cyclization and subsequent quenching of aryllithium intermediates with various electrophiles. A proposed mechanism is rationalized by some control experiments. (C) 1997 Elsevier Science Ltd.