4-Methoxybenzaldehyde → HCID 59648496, compound

HRID 1363261Notes

Reaction equation

HRID 1363261 reaction equation
N(C(=CC1SC=C(F)C=1)C(OCC)=O)=[N+]=[N-].[N:17]([C:20](=[CH:26][C:27]1[S:28][C:29]([F:32])=[CH:30][CH:31]=1)[C:21]([O:23][CH2:24][CH3:25])=[O:22])=[N+]=[N-].CCOC(C)=O.CCCCCCC.COC1C=CC(C=O)=CC=1>C1(C)C=CC=C(C)C=1>[F:32][C:29]1[S:28][C:27]2[CH:26]=[C:20]([C:21]([O:23][CH2:24][CH3:25])=[O:22])[NH:17][C:31]=2[CH:30]=1

Participants

6

Reactant 4

HCID 312444-MethoxybenzaldehydeHCID 21899848Ethylacetate heptaneHCID 86617319HCID 86617319, compoundHCID 86617320HCID 86617320, compound

Product 1

HCID 59648496HCID 59648496, compoundYield 15%

Reagents, catalysts & solvents 1

HCID 7929M-XyleneSolvent

Conditions

Temperature
145 °C

Procedure

A mixture of ethyl 2-azido-3-(4-fluorothiophen-2-yl)acrylate and ethyl 2-azido-3-(5-fluorothiophen-2-yl)acrylate (0.37 g) was dissolved in m-xylene (˜10 mL) and heated at 145° C. for 20 min in a capped 40-mL vial. The m-xylene was evaporated in vacuo and the resulting residue was chromatographed over silica gel (0 to 40% EtOAc in heptane over 30 min) to give two products: (a) 0.15 g of an impure pale oil with an Rf=0.25 (10:90 EtOAc/heptane), which stained a bright violet color when developed using anisaldehyde and heat, which was further purified via preparative HPLC using a Chromeleon purification system (methanol/0.1% formic acid-1% acetonitrile mixture in water, 50 mm Dynamax C-18, 28 mL/min (initial gradient of 20% methanol and increasing to 100% over 7 min) to give ethyl 2-fluoro-4H-thieno[3,2-b]pyrrole-5-carboxylate (48.9 mg, 3%). tR of product: 4.2-4.4 min. 1H NMR (400 MHz, CD3CN) δ ppm 10.10 (s, 1H), 6.98-7.05 (m, 1H), 6.69 (dd, J=2.05, 0.49 Hz, 1H), 4.29 (q, J=7.09 Hz, 2H), 1.33 (t, J=7.13 Hz, 3H). 19F NMR (376 MHz, CD3CN) δ ppm −122.18 (d, J=2.29 Hz, 1F). (b) 10.5 mg of an impure pale oil with an Rf=0.30 (10:90 EtOAc/heptane), which stained a bright red color when developed using anisaldehyde and heat, was further purified via preparative HPLC as described above (40%-100% methanol over 7 min) to give ethyl 3-fluoro-4H-thieno[3,2-b]pyrrole-5-carboxylate (5.4 mg, 0.3%). tR of product: 3-3.4 min. 1H NMR (400 MHz, CD3CN) δ ppm 10.30 (s, 1H), 7.06 (t, J=2.05 Hz, 1H), 6.90 (d, J=2.54 Hz, 1H), 4.32 (q, J=7.09 Hz, 2H), 1.34 (t, J=7.10 Hz, 3H). 19F NMR (376 MHz, CD3CN) δ ppm −144.16 (t, J=2.29 Hz, 1F).

Workup

  1. customThe m-xylene was evaporated in vacuo
  2. customthe resulting residue was chromatographed over silica gel (0 to 40% EtOAc in heptane over 30 min)
  3. customto give two products
  4. temperatureheat
  5. customwhich was further purified via preparative HPLC
  6. customa Chromeleon purification system (methanol/0.1% formic acid-1% acetonitrile mixture in water, 50 mm Dynamax C-18, 28 mL/min (initial gradient of 20% methanol
  7. temperatureincreasing to 100% over 7 min)

Sources & evidence

ORD record
ord-c1fdd8b8c2b74e398ab90b5900e31801
Source dataset
uspto-grants-2011_02
Patent number
US07884124B2

Reaction notes

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