5-Formyl-2-thiopheneboronic acid → 5-(7-dibutylamino-9H-fluoren-2-yl)-thiophene-2-carbaldehyde
Reaction equation
Br[C:2]1[CH:14]=[C:13]2[C:5]([C:6]3[CH:7]=[CH:8][C:9]([N:15]([CH2:20][CH2:21][CH2:22][CH3:23])[CH2:16][CH2:17][CH2:18][CH3:19])=[CH:10][C:11]=3[CH2:12]2)=[CH:4][CH:3]=1.[CH:24]([C:26]1[S:30][C:29](B(O)O)=[CH:28][CH:27]=1)=[O:25]>>[CH2:16]([N:15]([CH2:20][CH2:21][CH2:22][CH3:23])[C:9]1[CH:10]=[C:11]2[C:6]([C:5]3[CH:4]=[CH:3][C:2]([C:29]4[S:30][C:26]([CH:24]=[O:25])=[CH:27][CH:28]=4)=[CH:14][C:13]=3[CH2:12]2)=[CH:7][CH:8]=1)[CH2:17][CH2:18][CH3:19]Participants
3
Procedure
As shown in Scheme 1, 7-bromo-9H-fluoren-2-ylamine is reacted with 1-iodobutane to form (7-bromo-9H-fluoren-2-yl)-dibutyl amine (11). Then, (7-bromo-9H-fluoren-2-yl)-dibutyl amine (11) is reacted with 5-formyl-2-thiopheneboronic acid by Suzuki coupling reaction to obtain 5-(7-dibutylamino-9H-fluoren-2-yl)-thiophene-2-carbaldehyde (12a). Finally, in acetonitrile, 5-(7-dibutylamino-9H-fluoren-2-yl)-thiophene-2-carbaldehyde (12a) is reacted with cyanoacetic acid by using piperidine as a catalyst, to obtain 2-cyano-3-[5-(7-dibutylamino-9H-fluoren-2-yl)-thiophen-2-yl]-acrylic acid (13a).
Sources & evidence
- ORD record
- ord-15942080ca424e1ab37ecf927f7831ae
- Source dataset
- uspto-grants-2012_06
- Patent number
- US08203068B2
Reaction notes
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