Water → (R)-methyl 2-(4-chloro-5-(methoxycarbonyl)pyrimidin-2-yl)-1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate

HRID 1521532Notes

Reaction equation

HRID 1521532 reaction equation
Cl[C:2]1[N:7]=[C:6]([Cl:8])[C:5]([C:9]([O:11][CH3:12])=[O:10])=[CH:4][N:3]=1.[CH:13]([C@H:16]1[NH:21][CH2:20][CH2:19][N:18]2[C:22]3[CH:28]=[C:27]([S:29]([CH3:32])(=[O:31])=[O:30])[C:26]([C:33]([O:35][CH3:36])=[O:34])=[CH:25][C:23]=3[N:24]=[C:17]12)([CH3:15])[CH3:14].O>ClC(Cl)C.C(O)(C)(C)C.[Cl-].[Cl-].[Zn+2]>[Cl:8][C:6]1[C:5]([C:9]([O:11][CH3:12])=[O:10])=[CH:4][N:3]=[C:2]([N:21]2[CH2:20][CH2:19][N:18]3[C:22]4[CH:28]=[C:27]([S:29]([CH3:32])(=[O:30])=[O:31])[C:26]([C:33]([O:35][CH3:36])=[O:34])=[CH:25][C:23]=4[N:24]=[C:17]3[C@H:16]2[CH:13]([CH3:15])[CH3:14])[N:7]=1

Participants

6

Reactant 3

HCID 962WaterHCID 23156323Methyl 2,4-dichloropyrimidine-5-carboxylateHCID 89815671(R)-methyl 1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate

Product 1

HCID 117927157(R)-methyl 2-(4-chloro-5-(methoxycarbonyl)pyrimidin-2-yl)-1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylateYield 77.3%

Reagents, catalysts & solvents 2

HCID 3007855ZincchlorideCatalystHCID 86704321Dichloroethane t-butanolSolvent2×

Procedure

A solution of methyl 2,4-dichloropyrimidine-5-carboxylate (27 mg, 0.13 mmol) in dichloroethane/t-butanol (1:1, 2 mL) was cooled to 0° C. ZnCl2 solution (1.0 M in ether, 0.29 mL, 0.29 mmol, 2.2 eq.) was added. After stirring for 1 h, a solution of (R)-methyl 1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate (30 mg, 0.09 mmol) in dichloroethane/t-butanol (1:1, 2 mL) was added slowly at 0° C. The mixture was stirred at rt overnight. Water (10 mL) was added and the mixture was extracted with EtOAc (10 mL×3). The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated under vacuum. The residue was purified by preparative TLC to afford (R)-methyl 2-(4-chloro-5-(methoxycarbonyl)pyrimidin-2-yl)-1-isopropyl-7-(methylsulfonyl)-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyrazine-8-carboxylate (34 mg, 77.3% yield) as a solid.

Workup

  1. stirringThe mixture was stirred at rt overnight
  2. extractionthe mixture was extracted with EtOAc (10 mL×3)
  3. dry with materialThe combined organic layers were dried over anhydrous Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated under vacuum
  6. customThe residue was purified by preparative TLC

Sources & evidence

ORD record
ord-672e98364f5044149200984160eb7a6c
Source dataset
uspto-grants-2015_07
Patent number
US09073931B2

Reaction notes

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