Abstract:
The present invention relates to a triazine type monomer, and more particularly, to a 1,3,5-triazine type monomer characterized by having at least one amine group and at least two sulfur atoms, which can be used in manufacturing transparent optical resins having excellent refractive index, surface hardness and absorbance as well as an improved workability and the ability to control a wide range of refractive index according to the change in composition by the monomer itself at room temperature or by polymerizing the monomer with a comonomer in the presence of an organic solvent or an initiator.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a compound for producing a cyclopropyl-fused pyrrolidine-based inhibitor of dipeptidyl peptidase IV.SOLUTION: To provide a method for synthesizing (1S,3S,5S)-2-[(2S)-2-amino-2-(3-hydroxy tricyclo [3.3.1.13,7]des-1-yl)-1-oxoethyl]-2-azabicyclo[3.1.0]hexane-3-carbonitrile benzoates by coupling (αS)-α-amino-3-hydroxytricyclo[3.3.1.13,7]decane-1-acetic acid and (1S,3S,5S)-2-azabicyclo[3.1.0]hexane-3-carboxamides. The compound is useful as dipeptidyl peptidase IV inhibitor.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a compound for producing cyclopropyl-fused pyrrolidine-based inhibitors of dipeptidyl peptidase IV.SOLUTION: A solution of 4,5-dihydro-1H-pyrrole-1,5-dicarboxylic acid, 1-(1,1-dimethylethyl) 5-ethyl ester is treated with diethyl zinc and chloroiodomethane at a reduced temperature in a range of from about -30 to about 0°C to form a mixture of N-BOC-methanoproline ethyl ester isomers. The mixture of the isomers is treated with an aqueous solution of methyl amine to separate a syn-isomer. The resulting syn-isomer is treated with a strong base to yield syn-N-BOC-4,5-methanoproline, which is subsequently treated with N-methylmorpholine and isobutyl chloroformate, brine and ammonia to form (1S, 3S, 5S)-3-(aminocarbonyl)-2-azabicyclo[3.1.0]hexane-2-carboxylic acid 1,1-dimethylethyl ester.
Abstract:
PROBLEM TO BE SOLVED: To produce ε-caprolactam with an industrially advantageous simple method comprising small number of steps in high conversion of each step, high productivity and decreased energy consumption under a mild reaction condition with simple operation and equipment essentially without producing ammonium sulfate as a by-product while dispensing with a reaction reagent necessitating a complicate process for preparation. SOLUTION: ε-Caprolactam is produced by using benzene as a starting raw material and successively subjecting the material to partial hydrogenation, nitration, partial hydrogenation and vapor-phase rearrangement reaction.