Preparing amidines derived from 6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid
申请人:Societe de Conseils de Recherches et d'Applications Scientifiques (S.C.R.A.S.)
公开号:US06653472B1
公开(公告)日:2003-11-25
New intermediates of the formula (II)B described below for the synthesis of amidine derivatives of (−)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid, such as for example (S)-N-{4-[4-[(3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-yl)-carbonyl]-1-piperazinyl]phenyl}-2-thiophenecarboximidamide
wherein A′ is
X is —Z1—CO;
&rgr; is a bond or a heterocycle selected from the group consisting of piperidine, piperazine, homopiperazine, 2-methylpiperazine, 2,5-dimethyl-piperazine and 4-aminopiperidine;
Y is —Z2— or —NR3—Z2,
R3 is hydrogen, alkyl of 1 to 6 carbon atoms or —COR4,
R4 is alkyl of 1 to 6 carbon atoms;
Z1 and Z2 independently are a single bond or alkylene of 1 to 6 carbon atoms;
and R6 is hydrogen or OH.
以下是公式(II)B描述的新中间体,用于合成(−)-6-羟基-2,5,7,8-四甲基香豆素-2-羧酸的酰胺衍生物,例如(S)-N-4-[4-(3,4-二氢-6-羟基-2,5,7,8-四甲基-2H-1-苯并吡喃-2-基)-羰基]-1-哌嗪基}苯基-2-噻吩羧酰亚胺,其中A'为X为—Z1—CO;Γ为键或从哌啶、哌嗪、同哌啪嗪、2-甲基哌嗪、2,5-二甲基哌嗪和4-氨基哌嗪组成的杂环中选择的一个;Y为—Z2—或—NR3—Z2,R3为氢、1至6个碳原子的烷基或—COR4,R4为1至6个碳原子的烷基;Z1和Z2独立地为1至6个碳原子的烷基或烷基;R6为氢或-OH。