This invention provides a compound of the formula (I): And their use for the treatment of disease conditions caused by overactivation of the VR1 receptor such as pain, or the like in mammal. This invention also provides a pharmaceutical composition comprising the above compound.
This invention provides a compound of the formula
These compounds are useful for the treatment of disease conditions caused by overactivation of the VR1 receptor such as pain, or the like in mammal. This invention also provides a pharmaceutical composition comprising the above compound.
This invention provides a compound of the formula
These compounds are useful for the treatment of disease conditions caused by overactivation of the VR1 receptor such as pain, or the like in mammal. This invention also provides a pharmaceutical composition comprising the above compound.
This invention provides a compound of the formula (I): And their use for the treatment of disease conditions caused by overactivation of the VR1 receptor such as pain, or the like in mammal. This invention also provides a pharmaceutical composition comprising the above compound.
Synthesis of 6-hydroxy-2-naphthoic acid from 2,6-diisopropylnaphthalene using NHPI as a key catalyst
作者:Ryota Nakamura、Yasushi Obora、Yasutaka Ishii
DOI:10.1016/j.tet.2009.03.013
日期:2009.5
A new strategy to 6-hydroxy-2-naphthoic acid (HNPA) and 4-hydroxybenzoic acid from 2,6-diisopropylnaphthalene and p-cymene, respectively, was developed using the NHPI-catalyzed aerobic oxidation as a principal reaction. 2,6-Diisopropylnaphthalene was oxidized by the oxidation with O-2 (1 atm) by NHPI (10 mol %) combined with Co(OAc)(2) (0.5 mol %) to give 6-acetyl-2 -isopropylnaphthalene, which then was converted to 6-isopropyl-2-naphthoic acid Under O-2 (1 atm) in the presence of Co(OAc)(2) (0.5 mol %) and Mn(OAc)(2) (0.5 mol %), Esterification of the resulting acid followed by the aerobic oxidation produced methyl 6-hydroxy-2-naphthoate whose hydrolysis led to the desired HNPA. An alternative route involves the oxidation of 6-acetyl-2-isopropylnaphthalene to 6-acetyl-2-naphthol on which subsequent oxidation and deacetylation gave HNPA. This method was Successfully extended to the synthesis of 4-hydroxybenzoic acid from p-cymene. (C) 2009 Elsevier Ltd, All rights reserved.