Help With BGP!!!

Hi,

I have a question about BGP. Say you have 4 routers (R1, R2, R3 and R4). R1 is in AS 1. R2 and R4 are in the AS 24. R3 is connected to R2 and R4 and is not running BGP. OSPF is running between R2, R3 and R4 so all there interfaces and loopback are reachable. how can R4 get to R1's loopback without BGP running on R3 or adding a default route(or use redistribution)?

(AS1)      (   OSPF Ar 0       )
(R1)------(R2)---(R3)---(R4)

R4
router bgp 4
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 ebgp-multihop 4
neighbor 2.2.2.2 update-source loopback 1
bgp confederation identifier 24
bgp confederation peers 2

R2
router bgp 2
neighbor 4.4.4.4 remote-as 4
neighbor 4.4.4.4 ebgp-multihop 4
neighbor 4.4.4.4 update-source loopback 1
bgp confederation identifier 24
bgp confederation peers 4

neighbor 1.1.1.1 remote-as 1

R1
router bgp 1
neighbor 2.2.2.2 remote-as 24
network 1.1.1.0 mask 255.255.255.0

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