Chiral diphosphorus compounds and their transition metal complexes
View Patent ↗The present invention relates to chiral diphosphorus compounds and their transition metal complexes, to a process for preparing chiral diphosphorus compounds and their transition metal complexes and also to their use in asymmetric syntheses.
1. A chiral compound of the formula (XIII),
where
R 1 and R 2 may each independently be: hydrogen, C 1 –C 20 -alkyl, C 1 –C 20 -fluoroalkyl, C 2 –C 20 -alkenyl, C 4 –C 24 -aryl, C 5 –C 25 -arylalkyl, C 6 –C 26 -arylalkenyl or NR 7 R 8 , OR 8 , —(C 1 –C 8 -alkyl)-OR 8 , —(C 1 –C 8 -alkyl)-NR 7 R 8 or —O 2 CR 8 where R 7 and R 8 are each independently C 1 –C 8 -alkyl, C 5 –C 14 -arylalkyl or C 4 –C 15 -aryl, or R 7 and R 8 together are a cyclic amino radical having a total of 4 to 20 carbon atoms,
or R 1 and R 2 are each independently radicals of the formula (II)
—R 9 —SiR 10 R 11 R 12 (II)
where
R 9 is absent, or is oxygen or methylene and
R 10 , R 11 and R 12 are each independently C 1 –C 12 -alkyl, C 5 –C 15 -arylalkyl or C 4 –C 14 -aryl and
R 3 , R 4 , R 5 and R 6 are each independently R 13 , OR 14 or NR 15 R 16 where R 13 , R 14 , R 15 and R 16 are each independently C 1 –C 12 -alkyl, C 5 –C 15 -arylalkyl or C 4 –C 14 -aryl, or NR 15 R 16 together is a cyclic amino radical having 4 to 20 carbon atoms, or R 3 and R 4 and/or R 5 and R 6 in each case together are —O—R 17 —O— where R 17 is a radical selected from the group of C 2 –C 4 -alkylene, 1,2-phenylene, 1,3-phenylene, 1,2-cyclohexylene, 1,1′-ferrocenylene, 1,2-ferrocenylene, 2,2′-(1,1′-binaphthylene), 2,2′-(1,1′)-biphenylene and 1,1′-(diphenyl-2,2′-methylene)-diyl, and the radicals mentioned may optionally be mono- or polysubstituted by radicals selected from the group of fluorine, chlorine, C 1 –C 8 -alkoxy and C 1 –C 8 -alkyl.
2. Process for preparing a chiral compound of the formula (XV)
where R 1 , R 2 , R 5 , R 6 and R 13 are each as defined in claim 1 , comprising,
in step a)
converting chiral compound of the formula (XVI)
where R 1 and R 2 are each defined in claim 1 , in the presence of compounds of the formula (XVII)
(R 13 ) 2 PMet 2 (XVII)
where
Met 2 is lithium, sodium or potassium and
R 13 is as defined in claim 1 ,
to a chiral compound of the formula (XVIII)
where R 1 , R 2 , Met 2 and R 13 are as defined above,
and, in step b),
reacting the compounds of the formula (XVIII) with compounds of the formula (XIIb)
R 5 R 6 P—Y (XIIb)
where R 5 and R 6 are each as defined in claim 1 and
Y is chlorine, bromine, iodine, dimethylamino or diethylamino, to give compounds of the formula (XV).
3. Process according to claim 2 , characterized in that the compounds of the formula (XVIII) are converted by acidifying to compounds of the formula (XIX)
which, in step b), are converted by reacting with compounds of the formula (XIIb) to compounds of the formula (XV).
4. Process according to claim 3 , characterized in that step b) is carried out in the presence of a base.
5. A chiral compound of the formula (XVIII)
where R 1 , R 2 and R 13 are each as defined in claim 1 and Met 2 is lithium, sodium or potassium.
6. A chiral compound of the formula (XXIa),
where R 1 , R 2 and R 13 are each as defined in claim 1 and Met 2 is lithium, sodium or potassium.
7. A chiral Compound of the formula (XXIb),
where R 1 , R 2 and R 13 are each as defined claim 1 , and R 19 is C 1 –C 12 -alkyl, C 1 –C 12 -fluoroalkyl, C 5 –C 25 -arylalkyl or C 4 –C 24 -aryl.