Diethyl Ether → di-tert-butyl {[(2-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3,4-dioxocyclobut-1-en-1-yl)imino]bis(2,1-ethanediyl)}biscarbamate

HRID 459657Notes

Reaction equation

HRID 459657 reaction equation
[NH:1]([CH2:12][CH2:13][NH:14][C:15](=[O:21])[O:16][C:17]([CH3:20])([CH3:19])[CH3:18])[CH2:2][CH2:3][NH:4][C:5](=[O:11])[O:6][C:7]([CH3:10])([CH3:9])[CH3:8].C([O:24][C:25]1[C:26](=[O:57])[C:27](=O)[C:28]=1[NH:29][C:30]1[CH:31]=[N:32][N:33]([CH3:55])[C:34]=1[NH:35][C:36]([C:49]1[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=1)([C:43]1[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=1)[C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)C.C(N(CC)CC)C.C(OCC)C>C(Cl)(Cl)Cl>[CH3:55][N:33]1[C:34]([NH:35][C:36]([C:43]2[CH:44]=[CH:45][CH:46]=[CH:47][CH:48]=2)([C:49]2[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=2)[C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=2)=[C:30]([NH:29][C:28]2[C:25](=[O:24])[C:26](=[O:57])[C:27]=2[N:1]([CH2:2][CH2:3][NH:4][C:5](=[O:11])[O:6][C:7]([CH3:8])([CH3:9])[CH3:10])[CH2:12][CH2:13][NH:14][C:15](=[O:21])[O:16][C:17]([CH3:20])([CH3:19])[CH3:18])[CH:31]=[N:32]1

Participants

6

Reactant 4

HCID 3283Diethyl EtherHCID 8471TriethylamineHCID 15157893tert-butyl N-{2-[(2-{[(tert-butoxy)carbonyl]amino}ethyl)amino]ethyl}carbamate2×HCID 219045093-ethoxy-4-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl)amino}-3-cyclobutene-1,2-dione

Product 1

HCID 86597905di-tert-butyl {[(2-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3,4-dioxocyclobut-1-en-1-yl)imino]bis(2,1-ethanediyl)}biscarbamateYield 62.6%

Reagents, catalysts & solvents 1

HCID 6212ChloroformSolvent

Procedure

To a solution of di-tert-butyl [iminobis(2,1-ethanediyl)]biscarbamate (2.13 g) and 3-ethoxy-4-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3-cyclobutene-1,2-dione (1.91 g) in chloroform (10 ml) was added triethylamine (0.558 ml), and the mixture was stirred under reflux. After 9 hours, additional di-tert-butyl [iminobis(2,1-ethanediyl)]biscarbamate (1.82 g) was added to the reaction mixture, and the mixture was stirred under reflux for 1 day. To the reaction mixture was added diethyl ether, and the solution was washed successively with 5% aqueous citric acid solution, water and brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was chromatographed on silica gel eluting with methylene chloride/methanol (20:1) to give di-tert-butyl {[(2-{[1-methyl-5-(tritylamino)-1H-pyrazol-4-yl]amino}-3,4-dioxocyclobut-1-en-1-yl)imino]bis(2,1-ethanediyl)}biscarbamate (1.84 g) as a solid.

Workup

  1. temperatureunder reflux
  2. stirringthe mixture was stirred
  3. temperatureunder reflux for 1 day
  4. washthe solution was washed successively with 5% aqueous citric acid solution, water and brine
  5. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was chromatographed on silica gel eluting with methylene chloride/methanol (20:1)

Sources & evidence

ORD record
ord-bfb46a188a134f89b61ea18e2e7d4dd8
Source dataset
uspto-grants-2007_03
Patent number
US07192943B2

Reaction notes

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