Pyrrolidine → 5-Bromo-2-[4-(4-pyrrolidin-1-ylmethyl-phenyl)-but-1-ynyl]-pyridine

Participants

Reaction Conditions

Reaction Steps

0.24 mL (3.04 mmol) methanesulphonic acid chloride are added to a solution, cooled to 0° C., of 800 mg (2.53 mmol) {4-[4-(5-bromo-pyridin-2-yl)-but-3-ynyl]-phenyl}-methanol in 17 mL DCM and then a solution of 0.52 mL ethyldiisopropylamine in 3 mL DCM is added dropwise. The mixture is stirred for a further 30 min at 0° C., 0.51 mL (6.08 mmol) pyrrolidine is added, the reaction mixture is heated to RT and kept at this temperature for 5 h. To complete the reaction another 0.26 mL (3 mmol) pyrrolidine are added and stirred for 1 h at RT. The mixture is evaporated down i. vac., combined with 10 mL water and 20 ml EtOAc, acidified with 1 M HCl and the organic phase is separated off. The aqueous phase is made alkaline with 2 M Na2CO3 solution, extracted with 20 mL EtOAc, the organic phase is separated off and dried over Na2SO4. After the desiccant and solvent have been eliminated the desired product is obtained.

Provenance & Evidence