Phosphoric Acid → methyl 6-benzyl-4-cyclohex-1-en-1-yl-5-phenyl-6H-thieno[2,3-b]pyrrole-2-carboxylate

HRID 505825Notes

Reaction equation

[CH2:1]([N:8]1[C:12]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[CH:11][C:10]2[CH:19]=[C:20]([C:22]([O:24][CH3:25])=[O:23])[S:21][C:9]1=2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(OC(=O)C)(=O)C.[C:33]1(=O)[CH2:38][CH2:37][CH2:36][CH2:35][CH2:34]1.P(=O)(O)(O)O>C(O)(=O)C>[CH2:1]([N:8]1[C:12]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[C:11]([C:33]2[CH2:38][CH2:37][CH2:36][CH2:35][CH:34]=2)[C:10]2[CH:19]=[C:20]([C:22]([O:24][CH3:25])=[O:23])[S:21][C:9]1=2)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A solution (0.2 M) of methyl 6-benzyl-5-phenyl-6H-thieno[2,3-b]pyrrole-2-carboxylate in acetic acid was treated with acetic anhydride (10 eq.), cyclohexanone (10 eq.) and 85% phosphoric acid (2.3 eq.). The mixture was heated at 80° C. for 3 h, then was poured into ice cold ammonium hydroxide. The product was extracted with AcOEt and the combined organic phase was washed sequentially with aqueous HCl (1 N), aqueous NaHCO3 (saturated solution) and brine then dried and concentrated. The crude was purified by flash chromatography on silica gel (1:30 acetone/toluene) affording the title compound (95%) as a solid.

Workup

additionwas poured into ice cold ammonium hydroxide
extractionThe product was extracted with AcOEt
washthe combined organic phase was washed sequentially with aqueous HCl (1 N), aqueous NaHCO3 (saturated solution) and brine
customthen dried
concentrationconcentrated
customThe crude was purified by flash chromatography on silica gel (1:30 acetone/toluene)

Sources & evidence

ORD record: ord-95b360f9a3c646b79a7df11c424211a8
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07781431B2

Reaction notes

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