2, 3-bis(dialkylphosphino)pyrazine derivative, process of...

Details 2, 3-bis(dialkylphosphino)pyrazine derivative, process of... 2, 3-bis(dialkylphosphino)pyrazine derivative, process of...

2006-02-23

2009-10-27

Coleman, Brenda L (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

C544S229000

Reexamination Certificate

active

07608709

ABSTRACT:
An optically active 2,3-bis(dialkylphosphino)pyrazine derivative represented by formula (1) is disclosed. The pyrazine derivative is preferably a quinoxaline derivative represented by formula (2). In formula (1) and (2), R1is preferably a t-butyl or adamantyl group, and R2is preferably a methyl group.wherein R1is a substitutable straight chain or branched alkyl group having 2 to 10 carbon atoms; R2is a substitutable straight chain or branched alkyl group having fewer carbon atoms than R1; and R3and R4, which may be the same or different, are each a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or R3and R4are taken together to form a saturated or unsaturated ring.wherein R1and R2are as defined above; and R5is a monovalent substituent.

REFERENCES:
patent: 2005/0209455 (2005-09-01), Boerner et al.
patent: 2000-319288 (2000-11-01), None
Imamoto et. al. (Tetrahedron Asymmetry, 2005, 17, 560-565).
Imamoto et. al. (JACS, 2005, 127, 11934-11935 plus cover sheet).

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