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. 2015 May 18;6(7):764–769. doi: 10.1021/acsmedchemlett.5b00084

Table 1. Structure–Activity Relationships of the R1, R2, R3, R4, and X Groups; Cp = Cyclopentyl.

graphic file with name ml-2015-00084f_0006.jpg

compd R1 R2 R3 R4 X BRD4 Ki (nM)a PLK1 Ki (nM)a
BI-2536 (R)-Et Cp Me 3-OMe NH 56 ± 9 0.22 ± 0.01
39a (R)-Et Cp H 3-OMe NH 7950 ± 1550 ND
39b (R)-Et Cp Et 3-OMe NH 470 ± 10 0.91 ± 0.13
39c (R)-Et Cp iPr 3-OMe NH 4500 ± 300 ND
39d (R)-Et Cp iBu 3-OMe NH >10000 ND
39e (R)-Et Cp Bn 3-OMe NH >10000 ND
39f H Cp Me 3-OMe NH 1400 ± 400 ND
39g (S)-Et Cp Me 3-OMe NH 54 ± 4 0.42 ± 0.04
39h (R)-Bn Cp Me 3-OMe NH >10000 4.20 ± 0.99
39i (R)-Et iBu Me 3-OMe NH 970 ± 30 6.95 ± 1.63
39j (R)-Et 3-Br-C6H4CH2 Me 3-OMe NH 8.7 ± 1.3 5.80 ± 0.99
39k (R)-Et Cp Me H NH 60 ± 7 ND
39l (R)-Et Cp Me 2-OMe NH 37 ± 5 0.52 ± 0.01
39m (R)-Et Cp Me 3-F NH 46 ± 2 ND
39n (R)-Et Cp Me 3-OiBu NH 29 ± 9 ND
39o (R)-Et Cp Me 3-OBn NH 100 ± 0 ND
39p (R)-Et Cp Me 3-OCp NH 27 ± 8 0.84 ± 0.01
39q (R)-Et Cp Me 3-OMe O 99 ± 11 240 ± 14
a

Data represent the mean and standard deviation of two independent experiments. ND = not determined.