Acetic Acid → (2R,3R,5S)-2-(6-amino-9H-purin-9-yl)-5-(((tert-butyldimethylsilyl)oxy)methyl)tetrahydrofuran-3-ol

HRID 37395

反応式

HRID 37395 の反応式
[Si:1]([O:8][CH2:9][C@H:10]1[O:14][C@@H:13]([N:15]2[C:24]3[N:23]=[CH:22][N:21]=[C:19]([NH2:20])[C:18]=3[N:17]=[CH:16]2)[C@@H:12]2[O:25][C@H:11]12)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([BH-](CC)CC)C.[Li+].C(O)(=O)C>C1COCC1.CCOC(C)=O>[Si:1]([O:8][CH2:9][C@H:10]1[O:14][C@@H:13]([N:15]2[C:24]3[N:23]=[CH:22][N:21]=[C:19]([NH2:20])[C:18]=3[N:17]=[CH:16]2)[C@H:12]([OH:25])[CH2:11]1)([C:4]([CH3:6])([CH3:7])[CH3:5])([CH3:3])[CH3:2]

参加物

6

反応物 3

HCID 176Acetic AcidHCID 146813555'-O-(t-butyldimethylsilyl)-2',3'-anhydroadenosineHCID 23664628Lithiumtriethylborohydride

生成物 1

HCID 14192244(2R,3R,5S)-2-(6-amino-9H-purin-9-yl)-5-(((tert-butyldimethylsilyl)oxy)methyl)tetrahydrofuran-3-ol収率 90%

試薬・触媒・溶媒 2

HCID 8028Tetrahydrofuran溶媒2 回HCID 8857Ethyl Acetate溶媒

実験手順

To a stirred solution of 9.5 g (38.1 mmol) of 2',3'-anhydroadenosine (Robins, M. J.; Hansske, F; Low, N. H.; Park, J. I. Tetrahedron Lett. 1984, 367-370) in 114 mL of pyridine was added 11.5 g (76.2 mmol) of t-butyldimethylsilyl chloride. After 3.5 h at room temperature, an additional 5.75 g (38.1 mmol) of t-butyldimethylsilyl chloride was added. After a total of 4.25 h, the reaction mixture was diluted into 2 L of water and extracted with 3×500 mL of dichloromethane. The combined dichloromethane extracts were washed with one liter of saturated aqueous sodium bicarbonate, with 3×500 mL of water, and then dried over magnesium sulfate. Concentration under reduced pressure afforded 13.3 g of 5'-O-(t-butyldimethylsilyl)-2',3'-anhydroadenosine. To a stirred solution of 2.0 g (5.50 mmol) of 5'-O-(t-butyldimethylsilyl)-2',3'-anhydroadenosine in 55 mL of THF at 0° C. was added 22 mL (22 mmol) of a 1M solution of lithium triethyl borohydride in THF. The reaction mixture was then allowed to warm to room temperature. After 3 hours, the reaction mixture was recooled to 0° C. and then carefully treated with 4.0 mL of 5% aqueous acetic acid. The resulting mixture was diluted with 150 mL of EtOAc, washed with 3×100 mL of saturated aqueous NaCl, dried over magnesium sulfate, concentrated under reduced pressure, and then coevaporated with three portions of chloroform. Chromatography of the residue on silica gel with a 100:0 to 97:3 chloroform/methanol gradient afforded 1.8 g (90%) of the title compound: colorless glass; Rf =0.10 (silica gel 60 F-254, 0.25 mm, E. Merck (SG), 95:5 CHCl3 :MeOH); [α]D23 -47.8° (c 2.47, CHCl3); IR (CDCl3) 3480, 3415, 3320, 3165, 3125, 2960, 2935, 2860, 1635, 1595, 1575, 1470, 1415, 1330, 1290, 1255, 1210, 1135, 1090, 995 cm-1 ; 1H NMR (300 MHz, CDCl3, TMS=0.00 ppm) δ0.08, 0.09 (2s, 6H, (CH3)2Si), 0.88 (s, 9H, (CH3)3CSi), 2.10 (ddd, 1H, J=13.5 Hz, J'= 6.5 Hz, J"=4.0 Hz, 3'-H), 2.34 (ddd, 1H, J=13.5 Hz, J'=7.5 Hz, J"=6.0 Hz, 3'-H), 3.74 (dd, 1H, J=12.0 Hz, J'=3.0 Hz, 5'-H), 4.05 (dd, 1H, J=12.0 Hz, J'=3.0 Hz), 4.62 (dddd, 1H, J=7.5 Hz, J'=6.5 Hz, J"=J'"=3.0 Hz, 4'-H), 4.70 (ddd, 1H, J=6.0 Hz, J'=4.0 Hz, J"=2.5 Hz, 2'-H), 5.88 (bs, 1H, OH), 6.01 (d, 1H, J=2.5 Hz, 1'-H), 6.15 (bs, 2H, NH2), 8.30, 8.33 (2s, 2H, H-2, H-8); FAB MS, m/z 366 (M+H)+ , 136.

後処理

  1. customwas recooled to 0° C.
  2. washwashed with 3×100 mL of saturated aqueous NaCl
  3. dry with materialdried over magnesium sulfate
  4. concentrationconcentrated under reduced pressure

出典と根拠

ORDレコード
ord-30e60a80d3824f508b99b862f3f2d791
出典データセット
uspto-grants-1995_05
特許番号
US05420276

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