Compounds having a quinodimethane or a 7,8-dihydroquinodimethane nucleus and four substituted phosphinyl groups at the 7- and 8-positions are disclosed. A process for preparing the specified compounds is also disclosed.
Compounds of the formula (I) and (Ia) in the form of racemates, mixtures of diastereomers or in essentially enantiomerically pure form, (I), (Ia), where R is hydrogen, C
1
-C
8
alkyl, C
5
-C
12
cycloakyl, phenyl or phenyl substituted by from 1 to 3 C
1
-C
4
alky or C
1
-C
4
alkoxy groups; n is 0 or an integer from 1 to 4 and R
1
are identical or different subtitutuents selected from the group consisting of C
1
-C
4
alkyl, C
1
-C
4
fluoroalkyl and C
1
-C
4
alkoxy; X
1
and X
2
are each, indenpendently of one another, secondary phosphino; T is C
6
-C
20
arylene or C
3
-C
16
heteroarylene; and X
2
is bound in the ortho position relative to the T-cyclopenitadienyl bond. The compounds are ligands for complexes of metal selected from transition groups (I) and (VIII) of the Periodic Table of the Elements, and these metal complexes are valuable catalysts for the asymmetric addition of hydrogen, boron hydrides or silanes onto carbon-carbon or carbon-heteroatom multiple bonds in prochiral organic compounds or the asymmetric addition of carbon nucleophiles or amines onto allyl compounds.
1
The present invention provides a catalyst system capable of catalysing the carbonylation of an ethylenically unsaturated compound, which system is obtainable by combining: a) a metal of Group VIB or Group VIIIB or a compound thereof, b) a bidentate phosphine, arsine or stibine ligand, and c) an acid, wherein said ligand is present in at least a 2:1 molar excess compared to said metal or said metal in said metal compound, and that said acid is present in at least a 2:1 molar excess compared to said ligand, a process for the carbonylation of an ethylenically unsaturated compound, a reaction medium, and use of the system.
NOVEL CARBONYLATION LIGANDS AND THEIR USE IN THE CARBONYLATION OF ETHYLENICALLY UNSATURATED COMPOUNDS
申请人:Eastham Graham Ronald
公开号:US20100113255A1
公开(公告)日:2010-05-06
Novel bidentate ligands of general formula (I) are described Formula (I): R represents a hydrocarbyl aromatic structure. The substituent(s) Yx on the aromatic structure has a total X=1-
n
ΣtY
X
of atoms other than hydrogen such that
X-1-n
ΣtY
X
is 4 where n is the total number of substituent(s) Y
X
and tY
X
represents the total number of atoms other than hydrogen on a particular substituent Y
X
. The groups X
1
, X
2
, X
3
and X
4
are joined to Q
1
or Q
2
via tertiary carbon atoms to the respective atom Q
1
or Q
2
; and Q
1
and Q
2
each independently represent phosphorus, arsenic or antimony. A catalyst system and a process for the carbonylation of ethylenically unsaturated compounds utilising the catalyst system is also described.
METHOD OF SYNTHESIS OF FERROQUINE BY CONVERGENT REDUCTIVE AMINATION
申请人:Sanofi
公开号:US20130096306A1
公开(公告)日:2013-04-18
The invention relates to a method of synthesis of ferroquine of formula (F) or of its metabolite of formula (Fm):
comprising a reaction of reductive amination, said reaction comprising:
(i) a stage of condensation of an aldehyde-amino ferrocene of formula (III), in which R represents a hydrogen atom or a methyl group, with 7-chloroquinolin-4-amine as shown below,
followed by
(ii) a stage of reduction of the product of condensation obtained in the preceding stage and
(iii) then a stage of hydrolysis of the reaction mixture in the presence of an aqueous solution of ammonia or of citric acid.