Chlorotrimethylsilane → (3S,4aR,4bS,6S,8R,8aR,10aR)-3-Furan-3-yl-4a,8a-dimethyl-1,5-dioxo-6-trimethylsilanyloxy-dodecahydro-2-oxa-phenanthrene-8-carboxylic acid methyl ester

HRID 12317

Reaction equation

HRID 12317 reaction equation
[CH3:1][O:2][C:3]([C@@H:5]1[CH2:18][C@H:17]([OH:19])[C:16](=[O:20])[C@H:15]2[C@@:6]1([CH3:28])[CH2:7][CH2:8][C@H:9]1[C@:14]2([CH3:21])[CH2:13][C@@H:12]([C:22]2[CH:26]=[CH:25][O:24][CH:23]=2)[O:11][C:10]1=[O:27])=[O:4].CCN(CC)CC.Cl[Si:37]([CH3:40])([CH3:39])[CH3:38]>C(Cl)Cl>[CH3:1][O:2][C:3]([C@@H:5]1[CH2:18][C@H:17]([O:19][Si:37]([CH3:40])([CH3:39])[CH3:38])[C:16](=[O:20])[C@H:15]2[C@@:6]1([CH3:28])[CH2:7][CH2:8][C@@H:9]1[C@:14]2([CH3:21])[CH2:13][C@@H:12]([C:22]2[CH:26]=[CH:25][O:24][CH:23]=2)[O:11][C:10]1=[O:27])=[O:4]

Participants

5

Reactant 3

HCID 6397ChlorotrimethylsilaneHCID 8471TriethylamineHCID 11395172(2S,4aS,6aR,7R,9S,10aS,10bR)-9-(hydroxy)-2-(3-furanyl)dodecahydro-6a,10b-dimethyl-4,10-dioxo-2H-naphtho[2,1-c]pyran-7-carboxylic acid methyl ester

Product 1

HCID 11167140(3S,4aR,4bS,6S,8R,8aR,10aR)-3-Furan-3-yl-4a,8a-dimethyl-1,5-dioxo-6-trimethylsilanyloxy-dodecahydro-2-oxa-phenanthrene-8-carboxylic acid methyl esterYield 68%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of 8a (0.08 g, 0.20 mmol), NEt3 (0.1 mL, 0.72 mmol) and chlorotrimethylsilane (0.1 mL, 0.79 mmol) in CH2Cl2 (30 mL) was stirred at room temperature overnight. The mixture was washed with saturated NaHCO3 (2×10 mL) and H20 (50 mL), dried (Na2SO4), and the solvent was removed under reduced pressure. The resulting crude solid was purified by column chromatography (eluent: ethyl acetate/nhexanes) to afford 16 (0.06 g, 68%) as a white solid, mp 197-200° C.; 1H NMR (CDCl3): δ 0.14 (9H, s, (CH3)3SiO; 1.11 (3H, s, H-19); 1.48 (3H, s, H-29); 1.50-1.73 (3H, m, H-7α,β and H-11β); 1.79 (1H, ddd, J=3.0, 3.0, 10.5 Hz, H-6α); 2.03 (1H, dd, obscured, H-8); 2.06 (1H, s, H-10); 2.10-2.38 (3H, m, H-3α,β and H-6β); 2.57 (1H, dd, J=5.1, 10.5 Hz, H-11α); 2.69 (1H, dd, J=3.9, 12.9 Hz, H-4); 3.72 (3H, s, CO2CH3); 4.12 (1H, dd, J=7.5, 11.7 Hz, H-2); 5.56 (1H, dd, J=5.1, 11.4 Hz, H-12); 6.38 (1H, dd, J=0.8, 1.7 Hz, H-14); 7.40 (1H, m, H-15); 7.42 (1H, m, H-16).

Workup

  1. washThe mixture was washed with saturated NaHCO3 (2×10 mL) and H20 (50 mL)
  2. dry with materialdried (Na2SO4)
  3. customthe solvent was removed under reduced pressure
  4. customThe resulting crude solid was purified by column chromatography (eluent: ethyl acetate/nhexanes)

Sources & evidence

ORD record
ord-7caa50fd5b074b9d813eca73504ee6f7
Source dataset
uspto-grants-2010_06
Patent number
US07728001B2

Linked notes

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