(1S,4R)-2-Aza-bicyclo[2.2.1]hept-5-en-3-one Chemical Properties

Melting point:

94-97 °C(lit.)

Boiling point:

319.3±0.0 °C(Predicted)

Density 

1.198±0.06 g/cm3(Predicted)

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

form 

powder

pka

15.48±0.20(Predicted)

color 

Off-white

optical activity

[α]20/D +565°, c = 1 in chloroform

InChI

InChI=1S/C6H7NO/c8-6-4-1-2-5(3-4)7-6/h1-2,4-5H,3H2,(H,7,8)/t4-,5+/m0/s1

InChIKey

DDUFYKNOXPZZIW-CRCLSJGQSA-N

SMILES

[C@]12([H])C[C@]([H])(C=C1)C(=O)N2

CAS DataBase Reference

130931-83-8(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

HS Code 

2914290090

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich

(1S,4R)-2-Aza-bicyclo[2.2.1]hept-5-en-3-one Usage And Synthesis

Chemical Properties

OFF-WHITE TO BEIGE CRYSTALLINE POWDER

Uses

This lactam and its antipode are precursors to the enantiomers of the carbocyclic nucleoside carbovir. It has been demonstrated that (-)-carbovir is a potent inhibitor of HIV-1 and based on clinical trials it could become an alternative to AZT. AZT is a trademark of The Wellcome Foundation Ltd.

Synthesis

GENERAL METHOD: Unreacted N-hydroxymethyl-γ-lactams (1S,4R)-1 and (1R,4S)-2 (20 mg, 0.14 mmol) were dissolved in methanol (2 mL). Subsequently, ammonium hydroxide (2 mL) was added and the reaction mixture was stirred at room temperature for 4 hours. Upon completion of the reaction, the solvent was removed by rotary evaporator and the residue was purified by silica gel column chromatography, using ethyl acetate as eluent, to afford white crystals of (1S,4R)-3 [15 mg, 95%; [α]D25 = +545 (c 0.3, CHCl3), ee = 99%; literature value 13: [α]D25 = +549 (c 0.26, CHCl3), ee > 99%; melting point 95-98°C (recrystallized from i-Pr2O), literature value 13: 97-100°C] or (1R,4S)-4 [15 mg, 93%; [α]D25 = +125.5 (c 0.55, CHCl3), ee = 96%; literature value 13: [α]D25 = +158 (c 0.45, CHCl3), ee > 99%; melting point 78-81°C (recrystallized from i-Pr2O), literature value 13: 78-81°C]. （1H NMR (400 MHz, CDCl3, 25 °C, TMS) data for (1S,4R)-3: δ = 2.18-2.43 (m, 2H, CH2); 3.18-3.24 (m, 1H, CHCO); 4.30-4.37 (m, 1H, CHNH); 6.05 (br s, 1H, NH); 6.63-6.82 ( m, 2H, CH=CH). Elemental analysis: calculated values (C6H7NO): C, 66.04; H, 6.47; N, 12.84; measured values: C, 66.12; H, 6.38; N, 12.82. 1H NMR (400 MHz, CDCl3, 25 °C, TMS) data for (1R,4S)-4: δ = 1.33-1.97 (m, 6H, 3 × CH2) ; 2.76-2.85 (m, 1H, CHCO); 3.04 (br s, 1H, NH); 3.95-4.08 (m, 1H, CHNH). Elemental analysis: calculated values (C6H9NO): C, 64.84; H, 8.16; N, 12.60; measured values: C, 64.81; H, 8.13; N, 12.68.

References

[1] Tetrahedron Asymmetry, 2016, vol. 27, # 16, p. 729 - 731
[2] Tetrahedron Asymmetry, 1996, vol. 7, # 8, p. 2381 - 2386
[3] Tetrahedron: Asymmetry, 1994, vol. 5, # 7, p. 1155 - 1156

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