反応式
F[C:2](F)(F)[C:3](O)=O.N1(CC(O)=O)CCOCC1.[S:18]1[CH:22]=C[N:20]=[N:19]1.[C:23](N)([NH2:26])=[N:24]N.C(OC=C(C(OCC)=O)C(OCC)=O)C>>[N:20]1[C:3]2[CH:2]=[N:24][CH:23]=[N:26][C:22]=2[S:18][N:19]=1参加物
実験手順
5-Hydroxy-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidine-6-carboxamides. As described in Chart BL, (4-morpholinyl)acetic acid trifluoroacetic acid salt BL.1 (J. Med. Chem. 1994, 37, 4538-4554) is cyclized to the thiadiazole BL.2 with aminoguanidine in polyphosphoric acid. Condensation of BL.2 with diethyl ethoxymethylenemalonate followed by thermal cyclization affords thiadiazolopyrimidine BL.3. The resulting ester BL.3 is then saponified to afford the corresponding acid BL.4 which is then coupled with a benzylamine (e.g. 4-chlorobenzylamine) mediated by 1,1′-carbonyldiimidazole (or other suitable carboxylic acid activating agent) to provide amides of the general formula BL.5. A specific example of heterocycle W19.2 in which R8=OH is also prepared as described in Chart BL. Thiadiazole BL.2 is heated in xylenes with diethyl 2-(((4-chlorobenzyl)amino)carbonyl)malonate (prepared by the reaction of 4-chlorobenzylamine with triethyl methanetricarboxylate) to afford thiadiazolopyrimidine BL.6.
出典と根拠
- ORDレコード
- ord-e0b8b46c4f1c47d6a76a2bff9286f9c8
- 出典データセット
- uspto-grants-2005_06
- 特許番号
- US06903097B2
関連ノート
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