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With caesium carbonate;racemic-2-(di-tert-butylphosphino)-1,1?-binaphthyl; bis(dibenzylideneacetone)-palladium(0); In toluene; at 100℃; for 18.0h;
Example 8Preparation of tert-buty 4-[(2S)-l-methylpyrrolidin-2-yl]methoxy}-2- nitrobenzoate; In a round bottomed three neck flask under argon atmosphere were added toluene (15 ml), CSCO3 (1.6 gr, 5 mmol ), phosphine ligand 2-(di-tert-butylphosphino)-l,l'- binaphthyl (331 mg, 0.83 mmol) and Pd(dba)2 (380 mgr, 0.66 mmol). The mixture was degassed bubbling argon for five minutes. Then <strong>[890315-72-7]4-bromo-2-nitrobenzoic acid tert butyl ester</strong> (1 gr, 3.31 mmol) and (S)-(-)-l-methyl-2-pyrrolidinemethanol (0.78 ml, 6.62 mmol) were added and the mixture was heated to 100 0C for 18 hr. The reaction was cooled to room temperature, quenched with 30 ml of water and extracted twice with 25 ml of AcOEt. The organic phases were collected, dried over Na2SO4 and the solvents evaporated to obtain a red oil which was subjected to chromatography purification on a Biotage SPl automated system (90:10 DCM/MeOH (isocratic) to yield the pure title compound as a yellowish oil (460 mgr, 1.36 mmol, 41% yield)ESI(+) MS: m/z 337 (MH+).
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