Water → HCID 54182257, compound

Participants

Reaction Steps

1.3 kg of the compound from Example 6 are stirred with exclusion of moisture at -5° C. to +5° C. with 580 g of bromocycloheptane in 2.4 l of DMF. During the course of about 2 hours, a solution of 400 g of potassium tert-butoxide in 1.6 l of DMF is added. The mixture is stirred for a further 4 hours between -20° C. and -10° C. and 7.5 l of water are then added, during the course of which the title compound precipitates as a crude product. The crude product is centrifuged off, dried at 50° C. in vacuo and recrystallised twice using 6 l of ligroin; the solution is filtered hot in the first recrystallisation.

Provenance & Evidence