January 23, 2012

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 62 patent authorities around the world, and other reputable web sources.

The following patent record is from the CAplusSM database.


Patent Number: US 8067617
Title: Preparation of indolinonecarboxylates.
Inventor(s): Merten, Joern; Renner, Svenja; Reichel, Carsten
Patent Assignee(s): Boehringer Ingelheim International G.m.b.H., Germany
Source: PCT Int. Appl., 29pp. CODEN: PIXXD2
Language: English


Title compds. [I; R1 = H, ClCH2CO; R2, R3 = H; R2R3 = :C(OMe)Ph; when R1 = H, then R2R3 = :C(OMe)Ph], were prepared  Thus, di-Me malonate was heated with Na tert-amylate and Me 4-chloro-3-nitrobenzoate (preparation given) in N-methylpyrrolidone to give 95.4% di-Me [4-(methoxycarbonyl)-2-nitrophenyl]propanedioate. This was hydrogenated in HOAc over Pd/C at 45 degrees followed by heating at 115 degrees to give 87.2% 6-methoxycarbonyl-2-oxindole.

Please note:  Titles and abstracts for patent records in CAplus are routinely enhanced to better describe the claimed invention. In this example, CAS enhanced the abstract using additional information found in the patent.

View the full-text U.S. patent from USPTO.

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