Hydrochloric Acid → HCID 67243252, compound

HRID 2239533Notes

Reaction equation

[CH2:1]([NH:5][S:6]([CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)(=[O:8])=[O:7])[CH2:2][CH2:3][CH3:4].[C:16](OCC)(=[O:22])[C:17](OCC)=[O:18].CC(C)([O-])C.[K+].Cl>CN(C=O)C>[CH2:1]([N:5]1[C:17](=[O:18])[C:16]([OH:22])=[C:9]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[S:6]1(=[O:8])=[O:7])[CH2:2][CH2:3][CH3:4]

Participants

Conditions

Temperature: 0 °C

Procedure

N-Butyl-1-phenylmethanesulfonamide (2.0 g, 8.80 mmol) was dissolved in dry DMF (113 mL) under an atmosphere of nitrogen. Diethyl oxalate (1.44 g, 9.83 mmol) was added and the reaction mixture was cooled to 0° C. using an ice-bath. Potassium tert-butoxide (1.25 g, 11.14 mmol) was added in one portion and the reaction mixture was stirred for 5 mins at 0° C., followed by 19 h at rt. The mixture was cooled in an ice-bath and HCl (2M) was carefully added to give a pH˜1 of the mixture. Most of the solvents were evaporated and the residue was partitioned between HCl (2M) and EtOAc. The combined organic layers were washed with water several times, dried with MgSO4 and evaporated to dryness. The residue was purified using preparative HPLC (ACE C8, 0.1M NH4OAc/MeCN, gradient) to give the title compound (0.96 g, 39%); 1H NMR (400 MHz, DMSO-d6): δ 7.88-7.83 (m, 2H), 7.22-7.29 (m, 3H), 7.14 (bs, 1H), 6.98-7.15 (m, 2H), 3.48 (t, 2H), 1.59-1.67 (m, 2H), 1.27-1.37 (m, 2H), 0.88 (t, 3H); 13C NMR (100 MHz, DMSO-d6): δ 163.1, 158.4, 132.3, 128.7, 124.2, 123.2, 37.8, 30.9, 20.2, 14.1; Mass Spectrum: M−H′ 280.

Workup

waitfollowed by 19 h at rt
temperatureThe mixture was cooled in an ice-bath

Sources & evidence

ORD record: ord-4c27528471914385babad12b7a36748c
Source dataset: uspto-grants-2010_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07723333B2

Reaction notes

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