Potassium Carbonate → tert-Butyl 4-(4-(((benzyloxy)carbonyl)amino)-3-methylphenyl)-5,6-dihydropyridine-1(2H)-carboxylate

HRID 2272440Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9](=[O:18])[O:10][CH2:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)=[C:4]([CH3:19])[CH:3]=1.CC1(C)C(C)(C)OB([C:28]2[CH2:33][CH2:32][N:31]([C:34]([O:36][C:37]([CH3:40])([CH3:39])[CH3:38])=[O:35])[CH2:30][CH:29]=2)O1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[CH2:11]([O:10][C:9]([NH:8][C:5]1[CH:6]=[CH:7][C:2]([C:28]2[CH2:33][CH2:32][N:31]([C:34]([O:36][C:37]([CH3:40])([CH3:39])[CH3:38])=[O:35])[CH2:30][CH:29]=2)=[CH:3][C:4]=1[CH3:19])=[O:18])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A suspension of benzyl (4-bromo-2-methylphenyl)carbamate (I51) (1.00 g, 3.12 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (37) (1.16 g, 3.74 mmol), PdCl2(dppf)-DCM complex (310 mg, 0.374 mmol) and potassium carbonate (1.29 g, 9.36 mmol) in DMF (30 mL) was stirred under nitrogen at 80° C. for 16 hours. The volatiles were evaporated under reduced pressure and the residue adsorbed onto silica gel. Chromatography on silica gel (0-30% ethyl acetate/petroleum benzine 40-60° C.) gave the title compound (I52) (949 mg, 72%) as a yellow liquid; 1H NMR (400 MHz, CDCl3) δ 7.83-7.70 (m, 1H), 7.41-7.34 (m, 5H), 7.21 (dd, J=8.5, 1.9 Hz, 1H), 7.16 (d, J=1.8 Hz, 1H), 6.56 (s, 1H), 5.97 (s, 1H), 5.20 (s, 2H), 4.05 (d, J=2.9 Hz, 2H), 3.61 (t, J=5.7 Hz, 2H), 2.48 (d, J=1.5 Hz, 2H), 2.23 (s, 3H), 1.50 (d, J=2.6 Hz, 9H).

Workup

customThe volatiles were evaporated under reduced pressure

Sources & evidence

ORD record: ord-d9eba0b4d7f04e5b8875a220c83a5d2d
Source dataset: uspto-grants-2015_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09120761B2

Reaction notes

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