Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Peptide containing doai
Reexamination Certificate
2005-11-01
2005-11-01
Campell, Bruce R. (Department: 1654)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Peptide containing doai
Reexamination Certificate
active
06960567
ABSTRACT:
Process for producing N-[(2S)-sulfanyl-4-(1,5,5-trimethylhydantoinyl) butanoyl]-L-leucyl-L-tert-leucine N-methylamide by forming an intermediate compound N-[(2S)-thiobenzoyl-4-(1,5,5-trimethylhydantoinyl)butanoyl]-L-leucyl-L-tert-leucine N-methylamide by an improved process that substantially reduces the presence of contaminants in the reaction mixture.
REFERENCES:
patent: 5981490 (1999-11-01), Baxter et al.
patent: 6153757 (2000-11-01), Zook et al.
patent: 6262080 (2001-07-01), Warshawsky et al.
Greene, T.W. et al., “The Role of Protective Groups in Organic Synthesis”, 2ndEdition, pp. 1-9, (1991).
James Brian Leslie
North Jeffrey T.
Audet Maury
Bristol Myers Squibb Company
Campell Bruce R.
Cohen Jacqueline M.
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