N,N-Dimethylaniline → Ethyl 5-(4-chloro-5-phenylphthalazin-1-yl)nicotinate

HRID 593703Notes

Reaction equation

O[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][C:10]=2[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[C:5]([C:18]2[CH:19]=[N:20][CH:21]=[C:22]([CH:28]=2)[C:23]([O:25][CH2:26][CH3:27])=[O:24])=[N:4][N:3]=1.O=P(Cl)(Cl)[Cl:31].CN(C)C1C=CC=CC=1>C1(C)C=CC=CC=1>[Cl:31][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][C:10]=2[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[C:5]([C:18]2[CH:19]=[N:20][CH:21]=[C:22]([CH:28]=2)[C:23]([O:25][CH2:26][CH3:27])=[O:24])=[N:4][N:3]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a solution of ethyl 5-(4-hydroxy-5-phenylphthalazin-1-yl)nicotinate (3.50 g, 9.42 mmol) in toluene (35 mL) was added POCl3 (26.4 mL, 283 mmol) followed by N,N-dimethylbenzenamine (1.5 mL, 9.42 mmol). The resulting mixture was heated in a sealed tube at 100° C. for 12 h. The reaction mixture was allowed to cool to room temperature and concentrated under reduced pressure. The residue was dissolved in EtOAc (200 mL) and washed with saturated NaHCO3 (2×50 mL) solution. The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to yield ethyl 5-(4-chloro-5-phenylphthalazin-1-yl)nicotinate (3.50 g) as a yellow solid with LC-MS purity of 47% which was taken for the next step without further purification. LCMS (Condition 12): retention time 0.97 min, [M+1]=390.0.

Workup

temperatureto cool to room temperature
concentrationconcentrated under reduced pressure
dissolutionThe residue was dissolved in EtOAc (200 mL)
washwashed with saturated NaHCO3 (2×50 mL) solution
dry with materialThe combined organic extracts were dried over anhydrous Na2SO4
filtrationfiltered
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-905aff003c134a3da12a68587fca853c
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09242966B2

Reaction notes

Loading…