Preparation of optically active 2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]furan-4, 9-diones having anticancer activities
申请人:Iida Akira
公开号:US20080300415A1
公开(公告)日:2008-12-04
An object of the present invention is to provide a method for efficiently preparing (S)-2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]-furan-4,9-dione useful as a medicine at a low cost and in large amounts. According to the present invention, the desired (S)-2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]furan-4,9-dione can be prepared with high efficiency at a low cost and in large amounts by asymmetrically reducing 2-acetyl-5-hydroxynaphtho[2,3-b]furan-4,9-dione in the presence of an asymmetric ruthenium complex and a hydrogen donor.
本
NOVEL PREPARATION OF ANTICANCER-ACTIVE TRICYCLIC COMPOUNDS VIA ALKYNE COUPLING REACTION
申请人:IIDA Akira
公开号:US20120077986A1
公开(公告)日:2012-03-29
The present invention is directed to provide a novel preparation of anticancer-active tricyclic compounds via alkyne coupling reaction. The present invention provides a process for preparing a compound of formula (Ia) or (Ib):
wherein R
1
is optionally substituted C
1-6
alkyl, etc.; W is O, S or NR
2
; R
2
is hydrogen atom, etc.,
which comprises Step (a) in which a compound of formula (II):
wherein R
1
is the same as defined above,
and a compound of formula (III) or (IV):
wherein R
2
is the same as defined above; R
3
is hydrogen atom, etc.; X is halogen atom, etc., are reacted in the presence of a base, a copper catalyst and a palladium catalyst in an aprotic polar solvent.
A concise method for the synthesis of heterocycle-fused naphthoquinones such as naphtho[2,3-b]-furan-4,9-dione, 1H-benz[f]indole-4,9-dione, and naphtho[2,3-b]thiophene-4,9-dione was developed. This method employed Sonogashira coupling and tandem addition-elimination/intramolecular cyclization, and it enabled the preparation of versatile heterocycle-fused naphthoquinones from one substrate.
作者:Alaíde Braga de Oliveira、Délio Soares Raslan、Geovane G. de Oliveira、José Guilherme S. Maia
DOI:10.1016/0031-9422(91)80039-4
日期:1993.11
Abstract The trunkwood of Tabebuia incana afforded the lignans pawlownin and cycloolivil as the major constituents together with a cycloolivil acetonide, la
Anticancer Compound, Intermediate Therefor, and Processes for Producing These
申请人:Tokuda Harukuni
公开号:US20090042977A1
公开(公告)日:2009-02-12
The present invention provides a method for easily and inexpensively preparing a racemate or an optically-active 2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]furan-4,9-dione in high yields, 2-acetyl-2,3-dihydro-5-hydroxynaphtho[2,3-b]furan-4,9-dione which is useful as an intermediate for preparing NFD, and an anticancer agent comprising 2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]furan-4,9-dione as an active ingredient.
Said 2-(1-hydroxyethyl)-5-hydroxynaphtho[2,3-b]furan-4,9-dione is obtained in 4 or 5 steps by using comparatively inexpensive 5-hydroxynaphthalene-1,4-dione (also referred to as juglone) as a starting material.