1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → (3R)-[1-(2-Chloro-pyridin-4-yl)-pyrrolidin-3-yl]-methyl-amine

Temperatur

85 °C

To a stirring solution of 2-chloro-4-bromopyridine (4.3 g, 22.1 mmol) in toluene (100 mL) was added (R)-methyl-pyrrolidin-3-yl-amine (1.7 g, 17.0 mmol) and sodium tert-butoxide (2.5 g, 26.0 mmol). The flask was evacuated and flushed with N2(g) twice. A mixture of 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos; 590 mg, 1.0 mmol) and tris(dibenzylideneacetone)-dipalladium(0) (Pd2(dba)3; 310 mg, 0.34 mmol) was added in one portion and the mixture was heated at 85° C. for 20 h. The mixture was cooled to room temperature (rt), diluted with H2O (75 mL), and extracted with ethyl acetate (EtOAc; 3×). The combined organic layers were dried and concentrated to give a clear brown oil. The oil was purified by FCC (0 to 5% 2 M NH3 in MeOH/CH2Cl2) to give the title compound as a brown solid (1.1 g, 30%). MS (ESI): mass calcd. for C10H14ClN3, 211.09 m/z found, 212.1 [M+H]. 1H NMR (DMSO-d6): 7.86 (d, J=5.9, 1H), 6.47-6.38 (m, 2H), 3.45-3.17 (m, 4H), 3.11-3.01 (m, 1H), 2.29 (s, 3H), 2.15-2.00 (m, 1H), 1.82 (br s, 1H), 1.79-1.65 (m, 1H). Bicyclo[2.2.1]hept-2-yl-[(3R)-4-(3-methylamino-pyrrolidin-1-yl)-pyridin-2-yl]-amine. To a stirring mixture of [(3R)-1-(2-chloro-pyridin-4-yl)-pyrrolidin-3-yl]-methyl-amine (97 mg, 0.46 mmol), exo-2-aminonorbornane (164 μL, 1.4 mmol) in ethylene glycol dimethyl ether (DME; 4 mL) in a scintillation vial was added sodium tert-butoxide (245 mg, 2.6 mmol). To the stirring mixture was added in one portion Pd(OAc)2 (16 mg, 0.024 mmol) and racemic 2,2′-bis(diphenylphosphino)-1,1′-bihaphthyl (BINAP; 19 mg, 0.031 mmol). The mixture was heated at 65° C. for 20 h, then was cooled to rt and filtered through a plug of diatomaceous earth. The plug was washed with MeOH (2 mL) and the filtrate was purified directly by FCC (5% 2 M NH3 in MeOH/CH2Cl2) to give a clear light golden oil (70 mg, 54%). Bicyclo[2.2.1]hept-2-yl-[(3R)-4-(3-methylamino-pyrrolidin-1-yl)-pyridin-2-yl]-amine. To a stirring solution of bicyclo[2.2.1]hept-2-yl-[(3R)-4-(3-methylamino-pyrrolidin-1-yl)-pyridin-2-yl]-amine in 1:1 Et2O/CH2Cl2 (8 mL) was added 1 N HCl in Et2O (1 mL). The organic layers was separated and concentrated to give the desired product (89 mg, 100%) as a beige solid. MS (ESI): mass calcd. for C17H26N4, 286.2; m/z found, 287.3 [M+H]+. 1H NMR (DMSO-d6): 12.07 (s, 1H), 9.57 (br s, 1H), 9.46 (br s, 1H), 7.81 (d, J=5.1, 1H), 7.66 (d, J=4.6, 1H), 6.28 (d, J=7.4, 1H), 5.64 (s, 1H), 3.89 (br s, 1H), 3.85-3.61 (m, 3H), 3.49 (br s, 2H), 2.60 (s, 3H), 2.35-2.20 (m, 3H), 2.18 (s, 1H), 1.95-1.85 (m, 1H), 1.55-1.46 (m, 3H), 1.37-1.25 (m, 2H), 1.21-1.09 (m, 2H). The compounds in Example 2 through Example 15 were prepared using methods analogous to those described for Example 1.

1. customThe flask was evacuated
2. customflushed with N2(g) twice
3. additionwas added in one portion
4. temperatureThe mixture was cooled to room temperature (rt)
5. extractionextracted with ethyl acetate (EtOAc; 3×)
6. customThe combined organic layers were dried
7. concentrationconcentrated
8. customto give a clear brown oil
9. customThe oil was purified by FCC (0 to 5% 2 M NH3 in MeOH/CH2Cl2)

ORD-Eintrag

ord-be0eb5e836a24e0eac99d73ab03c28a0

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08841287B2