tert-butyl N-methyl-N-(4-oxobutyl)carbamate

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 50 parts of (1,1-dimethylethyl) (4-hydroxybutyl)methylcarbamate in 91 parts of dichloromethane was added dropwise to a mixture of 150 parts of pyridinium dichromate, 112 parts of molecular sieves and 1300 parts of dichloromethane at a temperature about 10° C. Upon completion, stirring was continued for 3 hours at room temperature. The reaction mixture was filtered, washed with 1,1'-oxybisethane and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using dichloromethane as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 35 parts (70%) of (1,1-dimethylethyl) methyl(4-oxobutyl)carbamate as a residue (int. 38). The reaction mixture was filtered washed with 1,1'-oxybisethane the filtrate was evaporated The residue was purified by column chromatography over silica gel The pure fractions were collected the eluent was evaporated with methylbenzene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 50 parts of (1,1-dimethylethyl) (4-hydroxybutyl)methylcarbamate in 91 parts of dichloromethane was added dropwise to a mixture of 150 parts of pyridinium dichromate, 112 parts of molecular sieves and 1300 parts of dichloromethane at a temperature about 10° C. Upon completion, stirring was continued for 3 hours at room temperature. The reaction mixture was filtered, washed with 1,1'-oxybisethane and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using dichloromethane as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 35 parts (70%) of (1,1-dimethylethyl) methyl(4-oxobutyl)carbamate as a residue (int. 38). The reaction mixture was filtered washed with 1,1'-oxybisethane the filtrate was evaporated The residue was purified by column chromatography over silica gel The pure fractions were collected the eluent was evaporated with methylbenzene

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture of 33 parts of cis-4-amino-5-chloro-2-methoxy-N-(3-methoxy-4-piperidinyl)benzamide, 30 parts of (1,1-dimethylethyl) methyl(4-oxobutyl)carbamate, 3-parts of a solution of thiophene in methanol 4% and 400 parts of methanol was hydrogenated at normal pressure and at room temperature with 5 parts of platinum-on-charcoal catalyst 5%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated, yielding 45.1 parts (100%) of (1,1-dimethylethyl) cis-[4-[4-[(4-amino-5-chloro-2-methoxybenzoyl)amino]-3-methoxy-1-piperidinyl]butyl]methylcarbamate as a residue (interm. 8). the catalyst was filtered off the filtrate was evaporated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a stirred and cooled (<10° C.) solution of 150 parts of pyridinium dichromate in 1300 parts of dichloromethane was added dropwise a solution of 50 parts of (1,1-dimethylethyl) (4-hydroxybutyl)methylcarbamate in 91 parts of dichloromethane. Upon complete addition, stirring was continued for 3 hours in the presence of 112 parts of molecular sieves of 4A at room temperature. The reaction mixture was filtered over magnesium sulfate, washed with 1,1'-oxybisethane and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using dichloromethane as eluent. The pure fractions were collected and the eluent was evaporated. The residue was taken up in methylbenzene and the whole was evaporated again, yielding 3.5 parts (6.9%) of (1,1-dimethylethyl) methyl(4-oxobutyl)carbamate as a residue (interm. 7). Upon complete addition stirring The reaction mixture was filtered over magnesium sulfate washed with 1,1'-oxybisethane the filtrate was evaporated The residue was purified by column chromatography over silica gel The pure fractions were collected the eluent was evaporated the whole was evaporated again

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 50 parts of (1,1-dimethylethyl) (4-hydroxybutyl)methylcarbamate in 91 parts of dichloromethane was added dropwise to a mixture of 150 parts of pyridinium dichromate, 112 parts of molecular sieves and 1300 parts of dichloromethane at a temperature about 10° C. Upon completion, stirring was continued for 3 hours at room temperature. The reaction mixture was filtered, washed with 1,1'-oxybisethane and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using dichloromethane as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 35 parts (70%) of (1,1-dimethylethyl) methyl(4-oxobutyl)carbamate as a residue (int. 38). The reaction mixture was filtered washed with 1,1'-oxybisethane the filtrate was evaporated The residue was purified by column chromatography over silica gel The pure fractions were collected the eluent was evaporated with methylbenzene