Triethylamine → Benzhydryl (6R,7R)-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

HRID 1905796Notes

Reaction equation

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

Participants

Conditions

Temperature: -10 °C

Procedure

To a suspension of 3-hydroxy-7beta-phenylacetylaminocepham-4-carboxylic acid diphenylmethyl ester (2) in dichloromethane (13 parts) cooling at -10° C. under nitrogen are added triethylamine (4 equivalents) and then methanesulfonyl chloride (2.0 equivalents) at -10° C. over 7 minutes. The produced methanesulfonate ester (3) solution is let react at -10° C. for 30 minutes, and diluted with dichloromethane, washed with water, 5% sulfuric acid, and water, dried over sodium sulfate, and concentrated. The residue is crystallized from methanol (4 parts) to give 7beta-phenylacetylamino-3-cephem-4-carboxylic acid diphenylmethyl ester (6). (Yield: 75.4%).

Workup

washwashed with water, 5% sulfuric acid, and water
dry with materialdried over sodium sulfate
concentrationconcentrated
customThe residue is crystallized from methanol (4 parts)

Sources & evidence

ORD record: ord-391e3d6c3fcf47c1ab968d92311a28cb
Source dataset: uspto-grants-1987_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04647658

Reaction notes

Loading…