2-Chloroethanol → HCID 9959249, compound

Participants

Reaction Steps

A stirred solution of 5-(2'-methyl-4'-(5-methyl-1,2,4-oxadiazol-3-yl)biphenyl4-carbonyl)-2,3,6,7-tetrahydrospiro[furo[2,3-f]indole-3,4'-piperidine] (E3 in WO 96/19477, 0.44 g, 0.87 mmole) in 2-butanone (30 ml) was treated with potassium carbonate (0.36 g, 2.6 mmole) and 2-chloroethanol (0.18 ml, 2.6 mmole) and heated under reflux for 56 hours, then additional potassium carbonate (0.36 g, 2.6 mmole) and 2-chloroethanol (0.18 ml, 2.6 mmole) added. Reflux was continued for a further 30 hours, then the mixture was concentrated in vacuo and the residue treated with 10% Na2CO3 solution and extracted with ethyl acetate. The extract was dried, concentrated in vacuo and the residue chromatographed on silica gel eluting with 0-10% methanol/chloroforn to afford the title compound as a pale yellow oil (0.18 g, 38%). This was converted to its hydrochloride salt and crystallised from acetone mp. >230° C.

Provenance & Evidence