Nucleotide analog composition and synthesis method
DCFirst Claim
1. A composition of formula (1) ##STR4## wherein B is adenin-9-yl and R independently is --H or --CH2 --O--C(O)--O--CH(CH3)2, but at least one R is --CH2 --O--C(O)--O--CH(CH3)2.
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Reexamination
Accused Products
Abstract
The invention provides a composition comprising bis(POC)PMPA and fumaric acid (1:1). The composition is useful as an intermediate for the preparation of antiviral compounds, or is useful for administration to patients for antiviral therapy or prophylaxis. The composition is particularly useful when administered orally. The invention also provides methods to make PMPA and intermediates in PMPA synthesis. Embodiments include lithium t-butoxide, 9-(2-hydroxypropyl) adenine and diethyl p-toluenesulfonylmethoxyphosphonate in an organic solvent such as DMF. The reaction results in diethyl PMPA preparations containing an improved by-product profile compared to diethyl PMPA made by prior methods.
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Citations
20 Claims
- 1. A composition of formula (1) ##STR4## wherein B is adenin-9-yl and R independently is --H or --CH2 --O--C(O)--O--CH(CH3)2, but at least one R is --CH2 --O--C(O)--O--CH(CH3)2.
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7. A composition comprising a lithium alkoxide and a 9-(2-hydroxypropyl)adenine solution.
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8. A composition comprising an (R,S)-PMPA solution at a pH of about 2.7-3.5 wherein the solution has less than about 0.1 g/mL (R,S)-PMPA and wherein about 90-94% of the PMPA is in the (R) configuration.
- 10. A method comprising contacting bis(POC)PMPA with fumaric acid.
- 12. A method comprising mixing a lithium alkoxide with a 9-(2-hydroxypropyl)adenine solution.
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15. A method comprising adjusting the pH of a solution comprising less than about 0.08 g/mL (R,S)-PMPA wherein about 90-94% of the PMPA is in the (R) configuration to a pH of about 2.7-3.5.
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16. A composition comprising a tablet containing 9- 2-(R)- bis (isopropoxycarbonyl)oxy!methoxy!phosphinoyl!methoxy!propyl!-adenine.fumaric acid (1:
- 1), pregelatinized starch, croscarmellose sodium, lactose monohydrate and magnesium stearate.
- View Dependent Claims (17, 18)
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19. A product produced by the process of preparing wet granules from a mixture comprising a liquid, 9- 2-(R)- bis (isopropoxycarbonyl)oxy!methoxy!phosphinoyl!methoxy!propyl!-adenine.fumaric acid (1:
- 1) and a pharmaceutically acceptable excipient.
- View Dependent Claims (20)
Specification