Hydrochloric Acid → (3R)-8-Cyclopropyl-7-(Naphtalen-1-ylmethyl)-5-oxo-2,3-dihydro-5H-thiazolo[3,2-a]pyridine-3,6-dicarboxylic Acid 3-Methyl Ester

HRID 606642Notes

Reaction equation

HRID 606642 reaction equation
[CH3:1][O:2][C:3]([CH:5]1[N:9]2[C:10](=[O:30])[C:11]([CH:28]=[O:29])=[C:12]([CH2:17][C:18]3[C:27]4[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=4)[CH:21]=[CH:20][CH:19]=3)[C:13]([CH:14]3[CH2:16][CH2:15]3)=[C:8]2[S:7][CH2:6]1)=[O:4].[O-:31]Cl=O.[Na+].Cl>CS(C)=O.O>[CH3:1][O:2][C:3]([C@H:5]1[N:9]2[C:10](=[O:30])[C:11]([C:28]([OH:31])=[O:29])=[C:12]([CH2:17][C:18]3[C:27]4[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=4)[CH:21]=[CH:20][CH:19]=3)[C:13]([CH:14]3[CH2:16][CH2:15]3)=[C:8]2[S:7][CH2:6]1)=[O:4]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 23668197Sodium ChloriteHCID 866117918-Cyclopropyl-6formyl-7-naphthalen-1-ylmethyl-5-oxo-2,3-dihydro-5h-thiazolo[3,2-a]pyridine-3-carboxylic acid methyl ester

Product 1

HCID 67047421(3R)-8-Cyclopropyl-7-(Naphtalen-1-ylmethyl)-5-oxo-2,3-dihydro-5H-thiazolo[3,2-a]pyridine-3,6-dicarboxylic Acid 3-Methyl EsterYield 98%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 962WaterSolvent2×

Procedure

To a solution of 2 (100 mg, 0.239 mmol) in dimethylsulfoxide (2.40 mL), NaH2PO4 (66.0 mg, 0.478 mmol), dissolved in water (0.960 mL), was added dropwise at room temperature. The mixture was then kept on ice and NaClO2 (86.0 mg, 0.956 mmol) dissolved in water (0.480 mL), was added dropwise during 30 min. A white precipitate formed. The reaction mixture was stirred in room temperature for 1 h and then poured into a separation funnel containing ice-cooled 1M HCl. The aqueous phase was extracted with CH2Cl2 and the combined organic phases concentrated. The residue was dissolved in H2O:MeCN, 8:2 and freeze dried to yield 5 as a white powder (102 mg, yield: 98%). 1H-NMR (400 Mhz, CDCl3) δ 14.60 (s, 1H, CO2H), 8.21 (d, J=8.32 Hz, 1H, ArH), 7.85 (d, J=7.68 Hz 1H, ArH), 7.67 (d, J=8.14 Hz, 1H, ArH) 7.61-7.45 (m, 2H, ArH) 7.30-7.21 (m, 1H, ArH), 6.69 (d, J=6.72 Hz, 1H, ArH), 5.78 (d, J=8.42 Hz, 1H, ArH), 5.51 (d, J=14.55 Hz, 1H, Nph-CH2) 5.37 (d, J=14.55 Hz, 1H, Nph-CH2) 3.87 (s, 3H, CH3) 3.82-3.72 (m, 1H, SCH2) 3.63-3.54 (m, 1H, SCH2) 1.44-1.32 (m, 1H, CH-cyclopropyl) 0.81-0.64 (m, 2H) 0.56 (sd, 2H, CH2-cyclopropyl) 13C-NMR (100 Mhz, CDCl3) δ 167.59, 165.24, 165.09, 163.75, 154.33, 134.92, 133.84, 132.16, 128.83, 126.78, 126.15, 125.76, 125.51, 123.40, 123.23, 118.68, 112.72, 64.10, 53.84, 33.35, 31.58, 12.10, 8.35, 7.67.

Workup

  1. additionwas added dropwise at room temperature
  2. additionwas added dropwise during 30 min
  3. customA white precipitate formed
  4. additionpoured into a separation funnel
  5. additioncontaining ice-
  6. extractionThe aqueous phase was extracted with CH2Cl2
  7. concentrationthe combined organic phases concentrated
  8. dissolutionThe residue was dissolved in H2O
  9. dry with materialMeCN, 8:2 and freeze dried

Sources & evidence

ORD record
ord-8176c1964e7f4ff29b65f3e94be72fb6
Source dataset
uspto-grants-2011_03
Patent number
US07915417B2

Reaction notes

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