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HRID51194

反应详情

EQUATION

反应方程式

HRID 51194 的结构方程式

REACTANTS

反应物

4
结构：O=C([O-])[O-].[K+].[K+]
HCID11430

Potassium Carbonate

CK2O3

结构：C1COCCOCCOCCOCCOCCO1
HCID28557

18-Crown-6

C12H24O6

结构：Cc1ccc(S(=O)(=O)O[C@H]2C[C@H](C(=O)OC(c3ccccc3)c3ccccc3)N(C(=O)OC(C)(C)C)C2)cc1
HCID10530720

未命名化合物

结构：O=C(Nc1cc[nH]c(=O)n1)c1ccccc1
HCID178522337

未命名化合物

PRODUCTS

生成物

1
结构：CC(C)(C)OC(=O)N1C[C@H](n2ccc(NC(=O)c3ccccc3)nc2=O)C[C@@H]1C(=O)OC(c1ccccc1)c1ccccc1
HCID10555454

未命名化合物

AUXILIARIES

试剂、催化剂与溶剂

2
结构：CN(C)C=O
溶剂HCID6228

N,N-Dimethylformamide

C3H7NO

结构：ClCCl
溶剂HCID6344

Dichloromethane

CH2Cl2

CONDITIONS

反应条件

温度
75 °C

PROCEDURE

实验过程

A reaction mixture containing the trans-D tosylate (7) (1.10 g, 2.00 mmol), N4-benzoylcytosine (0.475 g, 2.20 mmol), anhydrous K2CO3 (0.300 g, 2.20mmol) and 18-crown-6 (200 mg) in DMF (10 ml) was stirred at 70-80° C. under argon overnight. The white suspension was diluted with dichloromethane (75 ml), filtered through celite and the organic phase washed with water. Evaporation gave the crude product as an oil which was purified by column chromatography (SiO2, ethyl acetate). The more polar fractions (Rf 0.33) were combined and evaporated to give the N1-isomer (0.299 g, 25%) as a white foam. Recrystallisation from ethanol-water gave white crystals of N-tert-butoxycarbonyl-cis-4-(N4-benzoylcytosin-1-yl)-D-proline diphenylmethyl ester (11), m.p. 133-135° C., (Found C, 65.8; H, 6.5; N, 8.8%; C34H34N4O6.C2H5OH.H2O requires C, 65.6; H, 6.4; N, 8.5%), δH (200 MHz; CDCl3) 1.30 and 1.49 (9H, 2×s, Boc rotamers), 2.20 and 2.90 [2H, br m, CH2(3′)], 3.50-3.80 and 3.95-4.15 [2H, 2×br m, CH2(5′)], 4.45-4.70 [1H, br m, CH(2′)], 5.28 [1H, br m, CH(4′)], 6.87 (1H, s, CHPh2), 7.15-7.40 (10H, m, phenyl CH), 7.40-7.75 [5H, m, CH(5), CH(6) and benzoyl m- and p-CH], 7.89 (2H, d, J=7.4 Hz, benzoyl o-CH), 8.83 (1H, br s, NH); δC (50.28 MHz; CDCl3) 27.7 and 28.0 (Boc CH3 rotamers), 34.4 and 36.0 [CH2(3′) rotamers], 49.6 and 50.5 [CH2(5′) rotamers], 54.3 and 54.9 [CH(4′) rotamers], 57.6 [CH(2′)], 78.0 and 78.3 (CHPh2 rotamers), 81.3 (Boc C), 96.8 [CH(5)], 127.0-129.2 (aromatic CH), 133.4 (benzoyl C), 139.5 (aromatic C), 145.2 and 145.7 [CH(6) rotamers], 153.8 (Boc CO rotamers), 155.6 [C(2)], 162.0 [C(4)], 166.8 (benzoyl CO), 171.3 (ester CO); m/z (ES MS) 595 (M+H+, 100%); νmax (KBr)/cm−1 1743 (C═O), 1704s (C═O); λmax (CHCl3)/nm 266 (ε/dm3.mol−1.cm−1 8.9×104), 312 (3.4×104); [α]D23−13.6 (c=0.50, CHCl3).

WORKUP

后处理

  1. filtrationfiltered through celite
  2. washthe organic phase washed with water
  3. customEvaporation
  4. customgave the crude product as an oil which
  5. customwas purified by column chromatography (SiO2, ethyl acetate)
  6. customevaporated
  7. customto give the N1-isomer (0.299 g, 25%) as a white foam
  8. customRecrystallisation from ethanol-water