Diisopropylamine → Dimethyl-[3-(4-nitro-2-trifluoromethyl-phenyl)-prop-2-ynyl]-amine

Participants

Reaction Steps

t-Bu3P (0.25 M in dioxane, 8.9 mL, 2.2 mmol, 0.2 equiv), 3-dimethylamino-1-propyne (FLUKA) (1.65 mL, 15.6 mmol, 1.4 equiv), and i-Pr2NH (2.0 mL, 14.4 mmol, 1.3 equiv) are added sequentially to a mixture of 5-nitro-2-bromobenzotrifluoride (ALDRICH) (3 g, 11.1 mmol), CuI (0.148 g, 0.78 mmol, 0.07 equiv), and Pd(PhCN)2Cl2 (0.427 g, 1.1 mmol, 0.1 equiv) in dioxane (10 mL). The reaction mixture is stirred for 48 h at rt. Then, Pd(PhCN)2Cl2 (0.100 g) is added. After stirring for additional 24 h, the reaction mixture is diluted with EtOAc and H2O and filtered through a pad of Celite. The filtrate is extracted with EtOAc. The organic phase is washed with brine, dried (Na2SO4), filtered and concentrated. Purification of the crude material by silica gel column chromatography (CH2Cl2/NH3 (2 N in MeOH), 95:5) affords the title compound as a brown oil: ES-MS: 273.0 [M+H]+; single peak at tR=3.06 min (System 1); Rf=0.13 (CH2Cl2/NH3 (2 N in MeOH), 95:5).

Provenance & Evidence