Patent ID: 8293948

Claim:
A method for using a reagent shown in the following Chemical Formula (1) in an organic synthesis reaction: wherein R 1 , R 3 and R 5 are hydrogen, and R 2 and R 4 are independently selected from the group consisting of alkyl group with a carbon number of 18 to 30 which may have a substituent group, alkoxyl group with a carbon number of 18 to 30 which may have a substituent group, aryl group with a carbon number of 18 to 30 which may have a substituent group, acyl group with a carbon number of 18 to 30 which may have a substituent group, thioalkyl group with a carbon number of 18 to 30 which may have a substituent group, and dialkylamino group with a carbon number of 18 to 30 which may have a substituent group, and X represents a reagent active site shown by the following formulas (A) to (F), (H) to (M), (O), (A′) to (F′), or (H′) to (M′) wherein, in the formulas (A) to (F), (H) to (M) and (O), Y is an ester bond, ether bond, amide bond, thioester bond, sulfide bond, urea bond, carbamate bond, or carbonate bond, or an alkylene group with a carbon number of 1 to 10 which may have one of these bonds, and in formulas (M) and (M′), m and n are each independently 0 or 1, Za a chlorine atom or a bromine atom, Zb is a hydroxyl group, chlorine atom, or a bromine atom, comprising the following steps: (a) dissolving the reagent in a reaction system, (b) reacting the reagent active site X of Chemical Formula (1) with a target compound, and (c) separating a complex of the reagent and the target compound from the reaction system by reversibly changing the reagent from a liquid phase state to a solid phase state according to changes in solution composition and/or solution temperature.