Hydrochloric Acid → HCID 58860597, compound

Participants

Reaction Steps

Combine 9-borabicyclo[3.3.1]nonane (54.7 mL, 27.4 mmol, 0.5 M in THF) and (S)-1,4-dibenzyl-2-vinyl-piperazine (2.0 g, 6.84 mmol) and stir at ambient temperature. After 24 h, add triphenylphosphine (574 mg, 2.2 mmol), tetrakis(triphenylphosphine) palladium(0) (316 mg, 0.27 mmol) and 3-iodothiophene (1.93 g, 9.2 mmol). Add 3M NaOH (5.6 mL, 16.8 mmol) slowly, gas evolution occurs. Heat at reflux. After 48 h, cool to ambient temperature, add 5N HCl (12 mL), and stir 1 h. Extract with ethyl acetate and wash the extracts with 1N NaOH, water, brine, dry over sodium sulfate, filter and concentrate. Purify by silica gel chromatography using ethyl acetate/hexanes (10%) as the eluent to give 2.38 g of the title compound as an adduct of 9-BBN: mass spectrum (ion spray): m/z=377 (M+1).

Provenance & Evidence