[Problem] To provide a compound that has an intestinal phosphate transporter (NPT-IIb) inhibitory action and is useful as an active ingredient of an agent for treating and/or preventing hyperphosphatemia.
[Means for Solution] The present inventors conducted their studies on a compound that has an NPT-IIb inhibitory action and is useful as an active ingredient of an agent for treating and/or preventing hyperphosphatemia. As a result, they created an aminoalkyl-substituted N-thienylbenzamide derivative which has NPT-IIb inhibitory action, thereby completing the present invention. The aminoalkyl-substituted N-thienylbenzamide derivative of the present invention has an NPT-IIb inhibitory action and can be used as an agent for preventing and/or treating hyperphosphatemia.
[Problem] To provide a compound that has an intestinal phosphate transporter (NPT-IIb) inhibitory action and is useful as an active ingredient of an agent for treating and/or preventing hyperphosphatemia.
[Means for Solution] The present inventors conducted their studies on a compound that has an NPT-IIb inhibitory action and is useful as an active ingredient of an agent for treating and/or preventing hyperphosphatemia. As a result, they created an aminoalkyl-substituted N-thienylbenzamide derivative which has NPT-IIb inhibitory action, thereby completing the present invention. The aminoalkyl-substituted N-thienylbenzamide derivative of the present invention has an NPT-IIb inhibitory action and can be used as an agent for preventing and/or treating hyperphosphatemia.
The purpose is to provide a compound which has an intestinal phosphate transporter (NPT-IIb) inhibitory action and is useful as an active ingredient of an agent for treating and/or preventing hyperphosphatemia.
A tetrahydrobenzothiophene compound of the following formula (I) has NPT-IIb inhibitory action and can be used as an agent for treating and/or preventing hyperphosphatemia:
wherein, R1 represents —O-lower alkyl, -lower alkylene-phenyl, or the like; R2 and R3 are the same as or different from each other and represent H, lower alkyl, cycloalkyl, aryl, heteroaryl or the like, or, R2 and R3 may be combined with a nitrogen atom to which they bind to form 5- to 7-membered saturated cyclic amino; R4's are the same as or different from each other and represent halogen, lower alkyl; and n represents 0 to 2.
An iron-catalyzed ligand free conjugate reduction of α,β-unsaturatedketones with PMHS (polymethylhydrosiloxane) was reported to deliver the corresponding carbonylcompounds with up to 93% yield. This operationally simple protocol shows a broad substrate scope using readily available PMHS as a cost-effective and easy-to-handle reductive reagent.