Boron trifluoride etherate → Benzyl 7-((3aR,4S,7R,7aR)-7-methoxy-6,6-dimethyl-2-oxotetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yloxy)-8-methyl-2-oxo-6-propoxy-2H-chromen-3-ylcarbamate

HRID 1511231Notes

Reaction equation

HRID 1511231 reaction equation
B(F)(F)F.CCOCC.[OH:10][C:11]1[C:20]([CH3:21])=[C:19]2[C:14]([CH:15]=[C:16]([NH:23][C:24](=[O:33])[O:25][CH2:26][C:27]3[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=3)[C:17](=[O:22])[O:18]2)=[CH:13][C:12]=1[O:34][CH2:35][CH2:36][CH3:37].ClC(Cl)(Cl)C(=N)O[C@H:42]1[C@@H:47]2[O:48][C:49](=[O:51])[O:50][C@@H:46]2[C@@H:45]([O:52][CH3:53])[C:44]([CH3:55])([CH3:54])[O:43]1.C(N(CC)CC)C>C(Cl)Cl>[CH3:53][O:52][C@H:45]1[C:44]([CH3:55])([CH3:54])[O:43][C@@H:42]([O:10][C:11]2[C:20]([CH3:21])=[C:19]3[C:14]([CH:15]=[C:16]([NH:23][C:24](=[O:33])[O:25][CH2:26][C:27]4[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=4)[C:17](=[O:22])[O:18]3)=[CH:13][C:12]=2[O:34][CH2:35][CH2:36][CH3:37])[C@@H:47]2[O:48][C:49](=[O:51])[O:50][C@H:46]12

Participants

6

Reactant 4

HCID 8000Boron trifluoride etherateHCID 8471TriethylamineHCID 25140394Benzyl 7-hydroxy-8-methyl-2-oxo-6-propoxy-2H-chromen-3-ylcarbamateHCID 67094064(3aR,4S,7R,7aR)-7-methoxy-6,6-dimethyl-2-oxo-tetrahydro-3aH-[1.3]dioxolo[4,5-c]pyran-4-yl 2,2,2-trichloroacetimidate

Product 1

HCID 25138939Benzyl 7-((3aR,4S,7R,7aR)-7-methoxy-6,6-dimethyl-2-oxotetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-4-yloxy)-8-methyl-2-oxo-6-propoxy-2H-chromen-3-ylcarbamateYield 95.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Boron trifluoride etherate (16.7 μL, 0.13 mmol) was added to 23b (170 mg, 0.44 mmol) and (3aR,4S,7R,7aR)-7-methoxy-6,6-dimethyl-2-oxo-tetrahydro-3aH-[1.3]dioxolo[4,5-c]pyran-4-yl 2,2,2-trichloroacetimidate (643 mg, 1.77 mmol) in anhydrous CH2Cl2 (11.1 mL). After stirring at room temperature for 48 hours, triethylamine (150 μL) was added and the solvent was concentrated. The residue was purified via column chromatography (SiO2, 100:1→40:1 CH2Cl2:Acetone) to give 25b as a colorless foam (246 mg, 95%): 1H NMR (CDCl3, 500 MHz) 8.17 (s, 1H), 7.35-7.27 (m, 5H), 6.84 (s, 1H), 5.96 (s, 1H), 5.15 (s, 2H), 4.99 (d, J=7.5 Hz, 1H), 4.59 (d, J=9.7 Hz, 1H), 4.23 (d, J=9.6 Hz, 1H), 3.97 (t, J=6.6 Hz, 1H), 3.82-3.75 (m, 2H), 3.37 (s, 3H), 1.84-1.79 (m, 2H), 1.51 (s, 3H), 1.41 (s, 3H), 1.18 (s, 3H), 1.00 (t, J=7.5 Hz, 3H); 13C NMR (CDCl3, 125 MHz) δ 157.8, 154.3, 152.2, 151.8, 146.7, 144.2, 142.9, 134.6, 127.8, 127.6, 127.5, 127.5, 127.2, 121.0, 120.9, 111.1, 105.3, 101.7, 91.6, 85.7, 82.8, 80.0, 69.8, 58.1, 54.8, 28.3, 28.2, 22.4, 21.3, 9.4; IR (film) νmax 2961, 2939, 2906, 2359, 2341, 1811, 1757, 1726, 1522, 1445, 1371, 1267, 1175, 1113, 1086, 825, 768 cm−1; HRMS (ESI+) m/z: [M+Na]+ calcd for C30H33NO11, 606.1952. found, 606.1950.

Workup

  1. concentrationthe solvent was concentrated
  2. customThe residue was purified via column chromatography (SiO2, 100:1→40:1 CH2Cl2:Acetone)

Sources & evidence

ORD record
ord-92dea5d09a8040f2b70f8abdbc4e6d92
Source dataset
uspto-grants-2012_07
Patent number
US08212011B2

Reaction notes

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