Process for the production of tert-butyl...

Organic compounds -- part of the class 532-570 series – Organic compounds – Nitrogen attached directly or indirectly to the purine ring...

Reexamination Certificate

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C544S243000, C544S229000

Reexamination Certificate

active

06844437

ABSTRACT:
The invention concerns a process for the manufacture of tert-butyl (E)-(6-[2-4-(4-flourophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl]vinyl)-(4R,6S)-2,2-dimethyl[1,3]-dioxan-4-yl)acetate, the novel starting material used in said process and the use of the process in the manufacture of a pharmaceutical.

REFERENCES:
patent: 0 319 847 (1989-06-01), None
patent: 0 521 471 (1993-01-01), None
patent: WO 97 19917 (1997-06-01), None
Wess et al., “Stereoselective synthesis of HR 780 a newly highly potent HMG-coA reductase inhibitor”, Tetrahedron Letters, vol. 31, No. 18, 1990, p. 2545-2548.
Minami et al., “A novel enantioselective synthesis of HMG Co-A reductase inhibitor NK-104 and a related compound”, Tetrahedron Letters, vol 33, No. 49, 1992, p. 7525-7526.
Minami et al., “Stereoselective reduction of β, δ-diketo esters derived from tartaric acid. A facile route to optically active 6-oxo-3,5-syn-isopropylidenedioxyhexanoate, a versatile synthetic intermediate of artificial HMG Co-A reductase inhibitors”, Tetrahedron Letters, vol. 34, No. 3, 1993, p. 513-516.
Hiyama et al., “Synthesis of artificial HMG-CoA reductase inhibitors based on the olefination strategy”, Bull. Chem. Soc. Jpn., vol. 68, No. 1, 1995, p. 364-372.
Watanable et al., “Synthesis and biological activity of methanesulfonamide pyrimidine-and N-methanesulfonyl pyrrole-substituted 3,5-dihydroxy-6-heptenoates, a novel series of HMG Co-A reductase inhibitors”, Bioord. Med. Chem., vol. 5, No. 2, 1997, p. 437-444.
T. Hiyama et al.: “Synthesis of Artificial HMG-CoA Reductase Inhibitors Based on the Olefination Strategy” Bull. Chem. Soc. JPN., vol. 68, No. 1, 1995, pp. 364-372, XP000888402 *Scheme 3* table 1.

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