Molecular Formula | C11H17NO4 |
Molar Mass | 227.26 |
Density | 1.1781 (rough estimate) |
Melting Point | 152.9 °C |
Boling Point | 368.97°C (rough estimate) |
Flash Point | 185°C |
Vapor Presure | 6.65E-07mmHg at 25°C |
Appearance | White to off-white solid |
pKa | 4.31±0.40(Predicted) |
Storage Condition | under inert gas (nitrogen or Argon) at 2-8°C |
Sensitive | Sensitive to air |
Refractive Index | 1.5718 (estimate) |
MDL | MFCD00211287 |
Hazard Symbols | Xi - Irritant |
Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
WGK Germany | 3 |
FLUKA BRAND F CODES | 10-23 |
HS Code | 29223900 |
Hazard Class | IRRITANT |
Application | (-)-(1S,4R)-N-tert-butoxycarbonyl -4-aminocyclopenta-2-ene-1-formic acid is an organic intermediate, which can be composed of (1R,4S)-2-azabicyclo [2.2.1] hept-5-ene-3-one reacts with HCl aqueous solution to obtain (1S,4R)-4-ammonia cyclopenten-2-eneformic acid hydrochloride, and then reacts with di-tert-butyl bicarbonate to obtain (-)-(1S,4R)-N-tert-butoxycarbonyl-4-aminocyclopenta-2-en-1-formic acid. |
preparation | add HCl aqueous solution (2M,23.0ml,46.0mmol) to (1R,4S)-2-azabicyclo [2.2.1] hept-5-ene-3-one (5.0g,46mmol)/water (30.5ml) solution . After heating at about 80°C for about 2 hours at , the reaction mixture is cooled to ambient temperature and the solvent is removed under reduced pressure. The solids are dried in a vacuum oven at about 70°C and used without further purification. Add DIEA(32.0ml,183mmol) to (1S,4R)-4-ammonia cyclopentan-2-enoic acid hydrochloride (9.20g,45.8mmol)/1,4-dioxane (15ml) and water (18.3ml) solution at about 0 ℃. After stirring for about 5 minutes, add a solution of di-tert-butyl bicarbonate (di-tert-butyl dicarbonate)(11.7ml,50.4mmol)/1,4-dioxane hexane (5ml). The reaction mixture is heated to ambient temperature and stirred for about 18 hours. The solvent was removed under reduced pressure and the crude oil was dried in a vacuum oven at about 65°C for about 3 hours. The crude product was purified by silica gel chromatography with gradient elution of 80-100% EtOAc/heptane to obtain (-)-(1S,4R)-N-tert-butoxycarbonyl -4-aminocyclopente-2-ene-1-formic acid (5.2g,50%, two steps): LC/MS (table 2, method a)Rt = 1.81min;MS m/z:226(M-H)-. |