1-Indanone → 6-Chloro-inden-1-one

Participants

Reaction Steps

Further exemplary methods of synthesis include conversion of indanone A to intermediate C via treatment of 3-bromo-6-chloro-indan-1-one (A; for references on this material, see: Bøgesø EP 35363 A1 19810909 and Kehler, Juhl, Püschl, WO 2008025361; each herein incorporated by reference in its entirety) with a base such as triethylamine in a solvent such as tetrahydrofuran at ambient temperature (Scheme 1). Removal of the precipitated amine hydrobromide salt by filtration and concentration of the filtrate will afford 6-chloro-inden-1-one (B). This material can be reacted with phenyl-d5-boronic acid in the presence of approximately 1 equivalent of a base such as triethylamine and a catalytic amount of a 1:1 mixture of [Rh(ndb)2]BF4 (bis(norbornadiene)rhodium(I) tetrafluoroborate) and racemic BINAP (2,2′-bis(diphenylphosphino)-1,1′-binaphthyl) in a suitable solvent (e.g. approximately 10:1 solvent mixture of 1,4-dioxane and water) under an atmosphere of argon at elevated temperature (e.g. about 100° C.). Work-up will afford racemic 6-chloro-3-phenyl-d5-indan-1-one (C).

Provenance & Evidence