METHOD FOR PRODUCING AN OPTICALLY ACTIVE TETRAHYDROQUINOLINE
申请人:Moroi Takashi
公开号:US20100036149A1
公开(公告)日:2010-02-11
The present invention provides an industrially advantageous production method of optically active tetrahydroquinolines of formula (1),
which comprises:
1) a step of reacting a β-ketoester of formula (2)
with an amine of formula (3)
to produce an enaminoester of formula (4);
2) a step of subjecting the enaminoester of formula (4) above obtained in 1) to asymmetric hydrogenation to produce an optically active β-amino acid derivative of formula (5);
3) a step of amidating the optically active β-amino acid derivative (5) above obtained in 2) to produce an amide of formula (6);
4) a step of alkoxycarbonylating the amide of formula (6) above obtained in 3) to produce a compound of formula (7);
and
5) a step of subjecting the compound of formula (7) above to cyclization to produce the optically active tetrahydroquinoline of formula (1).
promising asymmetric synthesis of highly functionalized 2-oxospiro-[indole-3,4′-(1′,4′-dihydropyridine)] via the reaction of an enamine with isatylidenemalononitrile derivatives in the presence of a chiral base organocatalyst. The moderate, but promising, enantioselectivity observed (30%–58% ee (enantiomeric excess)) opens the door to a new area of research for the asymmetricconstruction of these