Tin tetrachloride → (3aR,5R,6S,7R,7aR)-5-(acetoxymethyl)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diyl diacetate

HRID 2194650Notes

Reaction equation

HRID 2194650 reaction equation
C(O[C@H:5]1[C@H:10]([NH:11][C:12]([NH:14][C:15]([O:17][CH2:18][CH:19]2[C:31]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:25]3[C:20]2=[CH:21][CH:22]=[CH:23][CH:24]=3)=[O:16])=[S:13])[C@@H:9]([O:32][C:33](=[O:35])[CH3:34])[C@H:8]([O:36][C:37](=[O:39])[CH3:38])[C@@H:7]([CH2:40][O:41][C:42](=[O:44])[CH3:43])[O:6]1)(=O)C.Cl[Sn](Cl)(Cl)Cl.C([O-])(O)=O.[Na+]>C(Cl)Cl>[C:37]([O:36][C@@H:8]1[C@@H:7]([CH2:40][O:41][C:42](=[O:44])[CH3:43])[O:6][C@H:5]2[C@H:10]([N:11]=[C:12]([NH:14][C:15]([O:17][CH2:18][CH:19]3[C:31]4[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=4[C:25]4[C:20]3=[CH:21][CH:22]=[CH:23][CH:24]=4)=[O:16])[S:13]2)[C@H:9]1[O:32][C:33](=[O:35])[CH3:34])(=[O:39])[CH3:38]

Participants

5

Reactant 3

HCID 24287Tin tetrachlorideHCID 516892Sodium BicarbonateHCID 86638169(2S,3R,4R,5S,6R)-6-(acetoxymethyl)-3-(3-(((9H-fluoren-9-yl)methoxy)carbonyl)thioureido)-tetrahydro-2H-pyran-2,4,5-triyl triacetate

Product 1

HCID 86638170(3aR,5R,6S,7R,7aR)-5-(acetoxymethyl)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diyl diacetateYield 69%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

The thiourea from above (200 mg, 0.32 mmol) was dissolved in CH2Cl2 (4 mL) and SnCl4 (0.5 mL, 4.0 mmol) was added. Then the resulting mixture was stirred at room temperature for 16 h. The solution was diluted saturated aqueous NaHCO3 (20 mL), then the resulting mixture was extracted with CH2Cl2 (3×10 mL) and the combined organic extracts were dried (Na2SO4) and concentrated. Flash chromatography of the residue (EtOAc:hexanes 2:3) gave (3aR,5R,6S,7R,7aR)-5-(acetoxymethyl)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diyl diacetate as a pale colourless foam (125 mg, 69% yield). 1H NMR 500 MHz, CDCl3) δ 1.88 (s, 3H), 2.04 (s, 3H), 2.12 (s, 3H), 3.69 (m, 1H), 3.81 (ddd, 1H, J=2.5, 5.5, 6.5 Hz), 4.12 (dd, 1H, J=2.5, 12.5 Hz), 4.21-4.26 (m, 2H), 4.55 (dd, 1H, J=6.0, 12.5 Hz), 4.72-4.75 (dd, 1H, J=6.5, 6.5 Hz), 4.95 (dd, 1H J=5.5, 9.5 Hz), 5.24 (dd, 1H J=6.5, 9.5 Hz), 6.01 (d, 1H, J=6.5 Hz), 7.35 (dd, 2H, J=7.1, 7.8 Hz), 7.44 (dd, 2H, J=7.0, 7.8 Hz), 7.59 (d, 2H, J=7.1 Hz), 7.81 (d, 2H, J=7.0 Hz). 13C NMR (125 MHz, CDCl3) δ 20.62, 20.71, 21.35, 46.78, 57.91, 63.70, 67.92, 69.46, 71.88, 72.52, 90.23, 120.71, 120.89, 123.83, 124.04, 125.15, 127.76, 127.97, 129.61, 129.72, 130.08, 141.31, 142.86, 152.11, 161.43, 169.11, 169.63, 170.23.

Workup

  1. extractionthe resulting mixture was extracted with CH2Cl2 (3×10 mL)
  2. dry with materialthe combined organic extracts were dried (Na2SO4)
  3. concentrationconcentrated

Sources & evidence

ORD record
ord-382e65fe8e5b4e299f8b3bdfd600f75d
Source dataset
uspto-grants-2012_12
Patent number
US08334310B2

Reaction notes

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