CAS No.134678-17-4,Lamivudine Suppliers

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Basic Information

Molecular Structure:
CAS No.:	134678-17-4
Name:	Lamivudine
Article Data:	59

Formula:	C₈H₁₁N₃O₃S
Molecular Weight:	229.26
Synonyms:	Epivir; GR109714X
EINECS:	603-844-3
Density:	1.73 g/cm³
Melting Point:	177 °C
Boiling Point:	475.4 °C at 760mmHg
Flash Point:	241.3 °C
Solubility:	70g/L(temperature not stated)
Appearance:	white crystalline powder
Risk Codes:	63-36/37/38
Safety:	26-36
PSA:	115.67000
LogP:	-0.01290

Synthetic route

: C9H11N3O4S*CH4O

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With sodium tetrahydroborate; ethanol at 0 - 20℃; for 4h;	97.9%

: Carbonic acid (2R,5S)-5-(4-acetylamino-2-oxo-2H-pyrimidin-1-yl)-[1,3]oxathiolan-2-ylmethyl ester (1S,2R,5S)-2-isopropyl-5-methyl-cyclohexyl ester

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With potassium carbonate In methanol at 0℃; for 10h;	95%

: (1R,2S,5R)-2-isopropyl-5-methylcyclohexyl (2R,5S)-5-[2-oxo-4-(phenylcarboxamido)-1,2-dihydro-1-pyrimidinyl]-1,3-oxathiolane-2-carboxylate

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
Stage #1: (1R,2S,5R)-2-isopropyl-5-methylcyclohexyl (2R,5S)-5-[2-oxo-4-(phenylcarboxamido)-1,2-dihydro-1-pyrimidinyl]-1,3-oxathiolane-2-carboxylate With methanol at 40℃; Inert atmosphere; Stage #2: With sodium tetrahydroborate; dipotassium hydrogenphosphate; water; sodium hydroxide In methanol at 20℃; for 1h; diastereoselective reaction;	95%

: 147027-10-9
(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl (2R,5S)-5-(4-amino-2-oxo-1,2-dihydro-1-pyrimidinyl)-1,3-oxathialane-2-carbaxylate

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With lithium aluminium tetrahydride In tetrahydrofuran for 0.5h; Ambient temperature;	94%
With methanol; sodium tetrahydroborate; dipotassium hydrogenphosphate; sodium hydroxide In water at 20℃; for 0.055h; Flow reactor;	94%
With sodium tetrahydroborate In ethanol	83%

: 173522-96-8
lamivudine salicyclic acid salt

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With triethylamine In ethanol at 50℃; for 1h;	92.63%
With triethylamine In water; ethyl acetate at 25 - 50℃; for 5h; Product distribution / selectivity;
With triethylamine In water; ethyl acetate at 45 - 50℃; for 4.5h;

: 4-amino-1-[(2R,5S)-(2-hydroxymethyl)-1,3-oxathiolan-5-yl]-1,2-dihydropyrimidin-2-one (S)-BINOL co-crystal

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
Stage #1: 4-amino-1-[(2R,5S)-(2-hydroxymethyl)-1,3-oxathiolan-5-yl]-1,2-dihydropyrimidin-2-one (S)-BINOL co-crystal With hydrogenchloride In water; ethyl acetate at 20℃; for 1h; pH=3 - 4; Stage #2: With sodium hydroxide In water pH=~ 7; Product distribution / selectivity;	90%
With hydrogenchloride In water; ethyl acetate pH=2 - 3; Large scale reaction; optical yield given as %ee;	70.02%
With hydrogenchloride In water; ethyl acetate pH=2 - 2.5;
Stage #1: 4-amino-1-[(2R,5S)-(2-hydroxymethyl)-1,3-oxathiolan-5-yl]-1,2-dihydropyrimidin-2-one (S)-BINOL co-crystal With hydrogenchloride In water; ethyl acetate at 20℃; for 0.0833333h; pH=3 - 4; Stage #2: With sodium hydroxide In water pH=6.8 - 7.2; Reagent/catalyst;	7 g
In water; ethyl acetate at 2 - 45℃; Industrial scale;	33.3 kg

: C7H5NO4*C8H11N3O3S

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With triethylamine In ethanol at 70 - 75℃; Inert atmosphere; Industry scale;	90%

: ((2R,5S)-5-(4-acetamido-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolan-2-yl)methyl benzoate

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With potassium carbonate In methanol at 20℃; for 14h; Inert atmosphere;	89%

: (-)-cis-4-amino-1-(2-hydroxymethyl-1,3-oxathiolan-5-yl)-(1H)-pyrimidin-2-one salicylate

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With triethylamine In Isopropyl acetate; water at 23 - 27℃; for 10h; Product distribution / selectivity;	88%

: 1012053-56-3
(2R,5S)-5-(4"-amino-2"-oxo-pyrimidin-1"-yl)-1,3-oxathiolane-2-methyl-(2'S-isopropyl-5'R-methyl-1'R-cyclohexyl)-carbonic acid diester

: 134678-17-4
lamivudine

Conditions

Conditions	Yield
With potassium carbonate In methanol at 0 - 25℃; for 3h;	87.17%
With potassium carbonate In methanol at 0 - 25℃; for 2h;	86%

Raw Materials

69-72-7

Downstream Products

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History

Lamivudine (CAS NO.134678-17-4) was produce by Bernard Belleau while at work at Nghe Nguyen-Ga and McGill University at the Montreal-based IAF BioChem International, Inc. laboratories in 1989. Initially designed as an antiviral agent, the drug's effectiveness for treating HIV in combination with AZT was discovered by Yung-Chi (Tommy) Cheng at Yale University. The drug was later licensed to the British pharmaceutical company Glaxo for a 14 percent royalty.
Lamivudine (CAS NO.134678-17-4) was approved by the Food and Drug Administration (FDA) on November 17, 1995 for use with zidovudine (AZT) and again in 2002 as a once-a-day dosed medication. The fifth antiretroviral drug on the market, it was the last NRTI for three years while the approval process switched to protease inhibitors. According to the manufacturer's 2004 annual report, its patent will expireand in Europe in 2011 and in the United States in 2010 .

Standards and Recommendations

APPEARANCE: White to off-white crystalline powder
ASSAY: 98.0 - 102.0%
RESIDUE ON IGNITION: 0.25% max
LOSS ON DRYING: 0.5% max
OPTICAL ROTATION: -93^° ~ -100^°HEAVY METALS: 20 ppm max

Specification

1. Introduction of Lamivudine
Lamivudine (CAS NO.134678-17-4) is a white crystalline powder. The IUPAC Name of this chemical is 4-amino-1-[(2S,5R)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]pyrimidin-2-one. Lamivudine belongs to Active Pharmaceutical Ingredients;Antivirals for Research and Experimental Use;Biochemistry;Chemical Reagents for Pharmacology Research;Nucleosides and their analogs;Nucleosides, Nucleotides & Related Reagents;Anti-virals;Intermediates & Fine Chemicals;Pharmaceuticals;API's.

Its Classification Code is Anti-HIV agents; Anti-Infective Agents; Anti-Retroviral Agents; Antiviral; Antiviral Agents; Enzyme Inhibitors; Nucleic Acid Synthesis Inhibitors; Reverse transcriptase inhibitors. Lamivudine is soluble in water, sparingly soluble in methanol and slightly soluble in ethanol.

2. Properties of Lamivudine
Physical properties about Lamivudine are:
(1)Index of Refraction: 1.754; (2)Molar Refractivity: 54.14 cm³; (3)Molar Volume: 132.2 cm³; (4)Polarizability: 21.46×10^-24 cm³; (5)Surface Tension: 79.3 dyne/cm; (6)Density: 1.73 g/cm³; (7)Flash Point: 241.3 °C; (8)Enthalpy of Vaporization: 85.17 kJ/mol; (9)Melting Point: 177 °C; (10)Boiling Point: 475.4 °C at 760 mmHg; (11)Vapour Pressure: 4.91E-11 mmHg at 25°C; (12)XLogP3: -0.9; (13)H-Bond Donor: 2; (14)H-Bond Acceptor: 4.

3. Structure Descriptors of Lamivudine
(1)Canonical SMILES: C1C(OC(S1)CO)N2C=CC(=NC2=O)N
(2)Isomeric SMILES: C1[C@@H](O[C@@H](S1)CO)N2C=CC(=NC2=O)N
(3)InChI: InChI=1S/C8H11N3O3S/c9-5-1-2-11(8(13)10-5)6-4-15-7(3-12)14-6/h1-2,6-7,12H,3-4H2,(H2,9,10,13)/t6-,7+/m1/s1
(4)InChIKey: JTEGQNOMFQHVDC-RQJHMYQMSA-N
(5)Smiles: c1cn(c(=O)nc1N)[C@@H]2CS[C@@H](O2)CO

4. Toxicity of Lamivudine
Oral Toxicity: Not expected to be toxic following ingestion.
Inhalation Toxicity: No studies have been conducted.

5. Safety information of Lamivudine
RTECS: UW7361333
Hazardous Substances Data: 134678-17-4(Hazardous Substances Data)

6. Uses of Lamivudine
Lamivudine has been used for treatment of chronic hepatitis B at a lower dose than for treatment of HIV. It improves the seroconversion of e-antigen positive hepatitis B and also improves histology staging of the liver. Long term use of lamivudine unfortunately leads to emergence of a resistant hepatitis B virus (YMDD) mutant. Despite this, lamivudine is still used widely as it is well tolerated. Lamivudine is a reverse transcriptase inhibitor and antiviral.

7. Production of Lamivudine
Selective 6-O-sulfonylation reaction of compound (I), followed by acetylation to give the compound (II) in 96.7% yield. The compound (II) in acetic acid as solvent, and 3 mol of hydrogen bromide / L acid (45%, w / v) reaction, brominated to give the compound (III), in 99% yield. Bromide (III) and 3.3moI. Xanthan ethyl potassium, in acetone under reflux, thio and cyclization; then subjected to hydrolysis with ammonia in methanol, to obtain the compound (IV), two step yield 72%. Compound (IV) was purified by column chromatography, as a crystalline solid. Compound (IV) with 1.4 moles of sodium periodate treatment, ring-opening to give a 2,3 - cis-diol; the formation of an aldehyde followed by reduction with sodium borohydride, and formed in the form of a ketal to protect the diol to give compound (V), 60% yield. The compound (V) silylation to protect the rest of the primary alcohol, and then stripped of the ketal to give the compound (VI), 63% yield. Lead tetraacetate to the diol compound (VI) oxide, and then to the Shop two pyridinium salt to further oxidation, to obtain compound (VII), this oxidation method does not affect the sulfur. The compound (VII) and then oxidation of the lead tetraacetate, to obtain the compound (VIII), in 66% yield [meter] with the compound (VI). The compound (VIII) and (IX), in dichloroethane, TMSOTf as Lewis acid catalyst, obtained by condensation of the compound (X), a 64% yield. Isomer thereof, in addition to the compound (X) at half the amount of the compound (X), they can be used silica gel chromatography to separate. The compound (X) with ammonia - methanol come acetyl, 73% yield; then tetra-n-butylammonium fluoride to de-silylation, i.e. to obtain naphthalene, 75% yield.

Production of Lamivudine

Or it can be got from Acetoxy-2-(diphenyl-t-butylsilyl-oxymethyl)-1,3-oxathiolane and 4-acetyl amino-2-trimethylsilyloxy pyrimidine dissolved in dichloroethane under the condensation of catalyzed Lewis acid.