Pyridine → tert-butyl (6R,7R)-8-oxo-3-[(2R)-oxolan-2-yl]-7-[[(2Z)-2-[2-(tritylamino)-1,3-thiazol-4-yl]-2-trityloxyiminoacetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

HRID 376565Notes

Reaction equation

HRID 376565 reaction equation
CS(Cl)(=O)=O.[C:6]([NH:25][C:26]1[S:27][CH:28]=[C:29](/[C:31](=[N:35]/[O:36][C:37]([C:50]2[CH:55]=[CH:54][CH:53]=[CH:52][CH:51]=2)([C:44]2[CH:49]=[CH:48][CH:47]=[CH:46][CH:45]=2)[C:38]2[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=2)/[C:32]([O-])=[O:33])[N:30]=1)([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[Na+].[NH2:57][C@@H:58]1[C:77](=[O:78])[N:60]2[C:61]([C:70]([O:72][C:73]([CH3:76])([CH3:75])[CH3:74])=[O:71])=[C:62]([C@H:65]3[CH2:69][CH2:68][CH2:67][O:66]3)[CH2:63][S:64][C@H:59]12.N1C=CC=CC=1>CN(C=O)C.C(OCC)(=O)C>[O:66]1[CH2:67][CH2:68][CH2:69][C@@H:65]1[C:62]1[CH2:63][S:64][C@@H:59]2[C@H:58]([NH:57][C:32](=[O:33])/[C:31](/[C:29]3[N:30]=[C:26]([NH:25][C:6]([C:19]4[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=4)([C:13]4[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=4)[C:7]4[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=4)[S:27][CH:28]=3)=[N:35]\[O:36][C:37]([C:50]3[CH:55]=[CH:54][CH:53]=[CH:52][CH:51]=3)([C:44]3[CH:45]=[CH:46][CH:47]=[CH:48][CH:49]=3)[C:38]3[CH:39]=[CH:40][CH:41]=[CH:42][CH:43]=3)[C:77](=[O:78])[N:60]2[C:61]=1[C:70]([O:72][C:73]([CH3:75])([CH3:74])[CH3:76])=[O:71]

Participants

7

Reactant 4

HCID 1049PyridineHCID 31297Methanesulfonyl chlorideHCID 10381740t-butyl (6R,7R)-7-amino-3-[(R)-tetrahydrofuran-2-yl]ceph-3-em-4-carboxylateHCID 23714200sodium (2Z)-2-[2-(tritylamino)-1,3-thiazol-4-yl]-2-trityloxyiminoacetate

Product 1

HCID 172930684tert-butyl (6R,7R)-8-oxo-3-[(2R)-oxolan-2-yl]-7-[[(2Z)-2-[2-(tritylamino)-1,3-thiazol-4-yl]-2-trityloxyiminoacetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylateYield 68%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

Methanesulphonyl chloride (96μl, 1.25mmol) was added to sodium 2-(2-tritylaminothiazol-4-yl)-2-(Z)-trityloxyiminoacetate (852mg, 1.2mmol) in DMF (2ml) at <-40° C. The mixture was stirred 0.5h at -30±10° C. then t-butyl (6R,7R)-7-amino-3-[(R)-tetrahydrofuran-2-yl]ceph-3-em-4-carboxylate (326mg, 1mmol) in DMF (2ml), followed by pyridine (101μl, 1.25mmol), were added. The reaction was stirred for 1h without further cooling then diluted with ethyl acetate, washed twice with water and with brine, dried, concentrated in vacuo and flash chromatographed eluting with 25, 30% ethyl acetate in hexane to give the title compound as a colourless foam (665mg, 68%); vmax (CH2Cl2) 3395, 1787, 1722, 1687, 1527, 1449, 1156 and 1051cm-1 ; δH (CDCl3 /CD3OH) 1.55 (9H, s), 1.65-2.25 (4H, m), 3.32 and 3.40 (2H, ABq, J 17.6Hz), 3.8-4.0 (2H, m), 5.08 (1H, d, J 4.8Hz), 5.13 (1H, dd, J 7.0, 8.1Hz), 5.91 (1H, d, J 4.5Hz), 6.56 (1H, s), 7.2-7.5 (30H, m). [Mass spectrum: +ve ion (3-nitrobenzyl alcohol, sodium acetate) MNa+ (1002)].

Workup

  1. additionwere added
  2. temperaturewithout further cooling
  3. washwashed twice with water and with brine
  4. customdried
  5. concentrationconcentrated in vacuo and flash
  6. customchromatographed
  7. washeluting with 25, 30% ethyl acetate in hexane

Sources & evidence

ORD record
ord-9bae6efc9c4e42f0a95829a95fdf6f4c
Source dataset
uspto-grants-2000_02
Patent number
US06020329

Reaction notes

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