tert-Butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate → 4-[6-(8-Cyclopentyl-6-ethyl-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino)-pyridin-3-yl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 586451Notes

Reaction equation

[CH:1]1([N:6]2[C:11]3[N:12]=[C:13](S(C)=O)[N:14]=[CH:15][C:10]=3[CH:9]=[C:8]([CH2:19][CH3:20])[C:7]2=[O:21])[CH2:5][CH2:4][CH2:3][CH2:2]1.[C:22]([O:26][C:27]([N:29]1[CH2:34][CH2:33][N:32]([C:35]2[CH:36]=[N:37][C:38]([NH2:41])=[CH:39][CH:40]=2)[CH2:31][CH2:30]1)=[O:28])([CH3:25])([CH3:24])[CH3:23]>C1(C)C=CC=CC=1>[C:22]([O:26][C:27]([N:29]1[CH2:34][CH2:33][N:32]([C:35]2[CH:36]=[N:37][C:38]([NH:41][C:13]3[N:14]=[CH:15][C:10]4[CH:9]=[C:8]([CH2:19][CH3:20])[C:7](=[O:21])[N:6]([CH:1]5[CH2:5][CH2:4][CH2:3][CH2:2]5)[C:11]=4[N:12]=3)=[CH:39][CH:40]=2)[CH2:31][CH2:30]1)=[O:28])([CH3:25])([CH3:23])[CH3:24]

Participants

Conditions

Temperature: 105 °C

Procedure

4-[6-(8-Cyclopentyl-6-ethyl-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino)-pyridin-3-yl]-piperazine-1-carboxylic acid tert-butyl ester was prepared by addition of 8-cyclopentyl-6-ethyl-2-methanesulfinyl-8H-pyrido[2,3-d]pyrimidin-7-one (0.80 g, 2.62 mmol) and 4-(6-amino-pyridin-3-yl)-piperazine-1-carboxylic acid tert-butyl ester (1.82 g, 6.55 mmol) to toluene (10 ml) followed by heating to 105° C. over 10 hours. The resulting suspension was filtered, the solid washed with toluene and dried in vacuo yielding 4-[6-(8-Cyclopentyl-6-ethyl-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-2-ylamino)-pyridin-3-yl]-piperazine-1-carboxylic acid tert-butyl ester as a solid (0.204 g). MS (APCI); M++1; Calc'd 520.3. Found 520.1.

Workup

filtrationThe resulting suspension was filtered
washthe solid washed with toluene
customdried in vacuo

Sources & evidence

ORD record: ord-019fe99efd464f90bf5b01fa214358a6
Source dataset: uspto-grants-2005_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06936612B2

Reaction notes

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