Title:
SYNTHESES FOR PREPARING 1,4-DIKETOPYRROLO[3,4-C]PYRROLES
Document Type and Number:
WIPO Patent Application WO2002068422
Kind Code:
A3
Abstract:
A synthesis for preparing asymmetrical 1,4-diketopyrrolo-[3,4-c]pyrroles involving: (a) reacting a beta -ketoamide with a strong base; (b) halogenating the same or a different beta -ketoamide; (c) reacting the reaction products of step (a) and (b) to form a succinamide; and (d) heating the succinamide in the presence of a Lewis Acid. Symmetrical 1,4-diketopyrrolo[3,4-c]pyrroles are synthesized by oxidatively dimerizing the reaction product of step (b) to form a succinamide; and heating the succinamide in the presence of a Lewis Acid.
Inventors:
CHAMBERLAIN TERENCE RICHARD
THE ESTATE OF CRAIG THORNLEY B
THE ESTATE OF CRAIG THORNLEY B
Application Number:
PCT/US2002/000143
Publication Date:
January 30, 2003
Filing Date:
January 04, 2002
Export Citation:
Assignee:
SUN CHEMICAL CORP (US)
International Classes:
C07D487/04; (IPC1-7): C07D487/04
Foreign References:
| US6057449A | 2000-05-02 | |||
| US5973146A | 1999-10-26 | |||
| US5616725A | 1997-04-01 | |||
| US4931566A | 1990-06-05 | |||
| US4659775A | 1987-04-21 | |||
| US4613669A | 1986-09-23 | |||
| US4579949A | 1986-04-01 |
Other References:
HEINZ LANGHALS ET AL.: "Highly Photostable Organic Fluorscent Pigments-A Simple Synthesis of N-Arylpyrrolopyrrolediones", JUSTUS LIEBIGS ANNALEN DER CHEMIE., 1996, VERLAG CHEMIE, WEINHEIM,, DE, pages 679 - 682, XP001084045, ISSN: 0075-4617
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