US 12,435,028 B2
Processes for the preparation of (S)-tert-butyl 4,5-diamino-5-oxopentanoate
John F. Traverse, Lebanon, NJ (US); Michael J. Zacuto, Jersey City, NJ (US); Weihong Zhang, Highland Park, NJ (US); Kirsten Faye Johnson, Morristown, NJ (US); Maryll E. Geherty, Pennington, NJ (US); and Christopher Marton, Garwood, NJ (US)
Assigned to Celgene Corporation, Summit, NJ (US)
Filed by Celgene Corporation, Summit, NJ (US)
Filed on Jan. 31, 2024, as Appl. No. 18/428,938.
Application 18/428,938 is a division of application No. 17/978,734, filed on Nov. 1, 2022, granted, now 11,912,644.
Application 17/978,734 is a division of application No. 16/894,429, filed on Jun. 5, 2020, granted, now 11,505,522, issued on Nov. 22, 2022.
Application 16/894,429 is a division of application No. 16/105,659, filed on Aug. 20, 2018, granted, now 10,717,703, issued on Jul. 21, 2020.
Claims priority of provisional application 62/548,268, filed on Aug. 21, 2017.
Prior Publication US 2024/0246899 A1, Jul. 25, 2024
Int. Cl. C07C 231/18 (2006.01); C07C 67/313 (2006.01); C07C 231/02 (2006.01); C07C 231/12 (2006.01); C07C 237/06 (2006.01); C07C 237/12 (2006.01); C07C 273/18 (2006.01); C07C 275/24 (2006.01); C07C 275/70 (2006.01); C07D 209/46 (2006.01)
CPC C07C 231/18 (2013.01) [C07C 67/313 (2013.01); C07C 231/02 (2013.01); C07C 231/12 (2013.01); C07C 237/06 (2013.01); C07C 237/12 (2013.01); C07C 273/1809 (2013.01); C07C 275/24 (2013.01); C07C 275/70 (2013.01); C07D 209/46 (2013.01)] 6 Claims
 
1. A process for the preparation of O-t-Bu-DIC isourea of the structure:

OG Complex Work Unit Chemistry
comprising reacting diisopropylcarbodiimide (DIC) with t-butanol and a Cu(I) salt in the presence of oxygen, wherein the oxygen is present in an amount of from about 1% to about 10% of the atmosphere.