Abstract: The object of the present invention is to provide 1-(1-tert-butoxycarbonyl-4-piperidylacetyl)-4-mesyloxypiperidine having a low content of impurities The object can be solved by a method for preparing 1-(1-benzyl-4-piperidylacetyl)-4-hydroxypiperidine, comprising the steps of: (1) reductively reacting 1-benzyl-4-piperidylidene acetic acid ethyl ester represented by the formula [1]: to obtain 1-benzyl-4-piperidyl acetic acid ethyl ester represented by the formula [2]: (2) adding an ammonium chloride aqueous solution and an organic solvent to the liquid containing 1-benzyl-4-piperidyl acetic acid ethyl ester, mixing the whole, and separating into an organic layer and an aqueous layer, (3) collecting 1-benzyl-4-piperidyl acetic acid ethyl ester from the organic layer, and (4) reacting the obtained 1-benzyl-4-piperidyl acetic acid ethyl ester with 4-hydroxypiperidine represented by the formula [3]: in the presence of base, to obtain 1-(1-benzyl-4-piperidylacetyl)-4-hydroxypiperidine repr

Abstract: The object of the present invention is to provide 1-(1-tert-butoxycarbonyl piperidylacetyl)-4-mesyloxypiperidine having a low content of impurities The object can be solved by a method for preparing 1-(1-benzyl piperidylacetyl)-4-hydroxypiperidine, comprising the steps of: (1) reductively reacting 1-benzyl-4-piperidylidene acetic acid ethyl ester represented by the formula [1]: to obtain 1-benzyl-4-piperidyl acetic acid ethyl ester represented by the formula [2]: (2) adding an ammonium chloride aqueous solution and an organic solvent to the liquid containing 1-benzyl-4-piperidyl acetic acid ethyl ester, mixing the whole, and separating into an organic layer and an aqueous layer, (3) collecting 1-benzyl-4-piperidyl acetic acid ethyl ester from the organic layer, and (4) reacting the obtained 1-benzyl-4-piperidyl acetic acid ethyl ester with 4-hydroxypiperidine represented by the formula [3]: in the presence of base, to obtain 1-(1-benzyl-4-piperidylacetyl)-4-hydroxypiperidine represented by the for

Abstract: The object of the present invention is to provide a simple method for preparing an N-alkoxycarbonyl piperidine derivative. The object can be solved by a method for preparing a hydroxypiperidine derivative, comprising a step of: (A) reacting a piperidylidene acetic acid derivative represented by the formula (1): wherein R1 is an aralkyl group which may have a substituent group, and R2 is an alkyl group, with 4-hydroxypiperidine in the presence of base, to obtain a hydroxypiperidine derivative represented by the formula (2) or the formula (3): wherein R1 is an aralkyl group which may have a substituent group.

Abstract: The object of the present invention is to provide a simple method for preparing an N-alkoxycarbonyl piperidine derivative. The object can be solved by a method for preparing a hydroxypiperidine derivative, comprising a step of: (A) reacting a piperidylidene acetic acid derivative represented by the formula (1): wherein R1 is an aralkyl group which may have a substituent group, and R2 is an alkyl group, with 4-hydroxypiperidine in the presence of base, to obtain a hydroxypiperidine derivative represented by the formula (2) or the formula (3): wherein R1 is an aralkyl group which may have a substituent group.

Abstract: The object of the present invention is to provide a method for preparing 4-(piperidin-4-yl)morpholine, which is easy to operate. The object can be solved by a method for preparing 4-(1-benzylpiperidin-4-yl)morpholine, characterized in that 5-fold molar or more of morpholine is added to 1-benzyl-4-piperidone, and the mixture is reacted with hydrogen under 1 MPa or less in the presence of platinum catalyst or palladium catalyst.

Abstract: The object of the present invention is to provide a method for preparing 4-(piperidin-4-yl)morpholine, which is easy to operate. The object can be solved by a method for preparing 4-(1-benzylpiperidin-4-yl)morpholine, characterized in that 5-fold molar or more of morpholine is added to 1-benzyl-4-piperidone, and the mixture is reacted with hydrogen under 1 MPa or less in the presence of platinum catalyst or palladium catalyst.

Abstract: A method of producing an N-alkoxycarbonylpiperidine derivative, comprising reacting an N-aralkylpiperidine derivative represented by the following general formula (1): wherein R1 represents an aralkyl group which may have a substituent, with a mesyl halide in the presence of a base, thereby obtaining a mesylated product represented by the following general formula (2): wherein R1 represents an aralkyl group which may have a substituent and Ms represents a mesyl group, and reacting the mesylated product with a dicarbonate represented by the following general formula (3): wherein R4 represents an alkyl group, in the presence of hydrogen and a catalyst containing palladium, thereby obtaining an N-alkoxycarbonylpiperidine derivative represented by the following general formula (4): wherein R4 represents an alkyl group and Ms represents a mesyl group.

Abstract: A method of producing an N-alkoxycarbonylpiperidine derivative, comprising reacting an N-aralkylpiperidine derivative represented by the following general formula (1): 1