Propyl p-toluenesulfonate → Pramipexole p-toluenesulfonate

Participants

Reaction Conditions

Reaction Steps

A 1000 ml, three necked flask was equipped with an overhead stirrer, a temperature probe, a heating mantle, a claisen joint, a condenser, and a 250 ml addition funnel. The flask was charged with 25 grams of (6S)-2,6 diamino-4,5,6,7-tetrahydro-benzothiazole, followed by 200 ml of dimethyl formamide (DMF). Under continuous stirring, the mixture was heated to a temperature of 75° C. The addition funnel was charged with a solution of 39.5 grams propyl tosylate and 32.5 ml diisopropylethyleamine in 50 ml DMF. This solution was added to the 1000 ml flask dropwise over a period of 2.0 hours. The reaction was monitored by analysis on HPLC.

Provenance & Evidence