Hydrogen Bromide → 2-Amino-5-bromo-1H-pyrrole-3,4-dicarbonitrile
反応式
[C:1]([C:3]([C:9]#[N:10])=[C:4]([C:7]#[N:8])[C:5]#[N:6])#[N:2].[BrH:11].[OH-].[Na+]>>[NH2:2][C:1]1[NH:6][C:5]([Br:11])=[C:4]([C:7]#[N:8])[C:3]=1[C:9]#[N:10]参加物
実験手順
Tetracyanoethylene (1) is reacted with HBr followed by treatment with a base such as NaOH produced 2-amino-5-bromo-3,4-dicyanopyrrole (3). Treatment of 3 with triethyl orthoformate followed by the addition of sodium hydride and 1 equivalent of the appropriate alkylating agent, with a catalytic amount of tetrabutylammonium iodide, gives the intermediate (5). The synthetic route is dependent upon correctly placing the alkyl substituents on the N7 position. Alkylation of 5 before cyclization controls the regiochemistry. Reaction of 5 with methanolic ammonia affords the 7-alkylated-4-amino-6-bromo-5-cyanopyrrolo[2,3-d]pyrimidines (6). Thus, by selecting the appopriate alkyl substiuent, the desired 7-alkylated-4-amino-6-bromo-5-cyanopyrrolo[2,3-d]pyrimidines can be prepared.
出典と根拠
- ORDレコード
- ord-755e6153d68c49cbb55372a9785dafcb
- 出典データセット
- uspto-grants-2002_01
- 特許番号
- US06342501B1
反応ノート
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