Polymeric salen compounds and methods thereof
The present disclosure provides a polymerizable compound of the formula (I) where the R 1 , R 2 , R′ 1 , R′ 2 , X 1 to X 8 , Y 1 , Y 2 , M and L have any of values as defined in the specification. The disclosure also provides an oligomer, a homo-polymer, or a co-polymer of compound of the formula (I). The disclosure also provides methods for preparing the compound of the formula (I) and methods for preparing polymers of the compound of the formula (I), and to methods and intermediates useful for preparing them. The disclosure also provides methods for the use of the polymers of formula (I) as chiral catalysts in enantioselective preparative processes.
1. A compound selected from the group consisting of
2. The compound of claim 1 having the structure represented by formula (1):
3. The compound of claim 1 selected from the group consisting of:
4. The compound of claim 1 having the structure represented by formula (4)
5. The compound of claim 1 having the structure represented by formula (5)
6. The compound of claim 1 having the structure represented by formula (6)
7. The compound of claim 1 having the structure represented by formula (7)
8. A process for preparing the compound of claim 2 , which comprises:
a) reacting a salicylaldehyde (8)
with an (1R,2R)-amino-ammonium cyclohexyl chloride (9)
to obtain a compound (10)
b) reacting a compound (10) in the presence of Et 3 N with compound (11)
to obtain compound (12);
and
c) reacting compound (12) with compound (13)
to obtain compound (1)
9. The process of claim 8 , which further comprises:
d) reacting compound (1) with Mn(OAc) 2 and then LiCl to obtain compound (2)
10. The process of claim 8 , which further comprises:
d) reacting compound (1) with Co(OAc) 2 to obtain compound (3)
11. A process for preparing the compound of claim 4 , which comprises:
a) reacting a salicylaldehyde (8)
with an (R,R)-amino-ammonium cyclohexyl chloride (14)
to obtain a compound (15)
and
b) reacting compound (15) in the presence of Et 3 N and a compound (16)
to obtain compound (4)
12. The process of claim 11 , which further comprises:
d) reacting compound (4) with Co(OAc) 2 to obtain compound (5)
13. A process for preparing the compound of claim 6 , which comprises:
a) reacting a salicylaldehyde (8)
with an (R,R)-amino-ammonium cyclohexyl chloride (14)
to obtain a compound (15)
and
b) reacting a compound (15) in the presence of Et 3 N and a compound (17)
to obtain compound (6)
14. The process of claim 13 , which further comprises:
d) reacting compound (6) with Co(OAc) 2 to obtain compound (7)