The enantiomers, (R)-(-)-1 and (S)-(+)-1, of (±)-4-amino-N-[2-(1-azabicyclo[3.3.0]octan-5-yl)ethyl]-5-chloro-2, 3-dihydro-2-methylbenzo[b]furan-7-carboxamide [(±)-1] were prepared from optically active benzyl 4-acetylamino-2, 3-dihydro-2-methylbenzo[b]furan-7-carboxylate[(R)-(+)-6, (S)-(-)-6], respectively. The requisite (R)-(+)-6 and (S)-(-)-6 were prepared by large-scale preparative HPLC on chiral stationary phases (CSPs). The absolute configuration of (S)-(+)-1 was determined by single crystal X-ray analysis. The serotonin 5-HT4 receptor agonistic activity of (S)-(-)-1 hemifumarate (SK-951) which was hemifumarate of (S)-(+)-1 was about twice that of the other enantiomer (R)-(+)-1 hemifumarate which was hemifumarate of (R)-(-)-1.
(±)-4-
氨基-N-[2-(1-
氮杂双环[3.3.0]
辛烷-5-基)乙基]-5-
氯-2,3-二氢-2-甲基苯并[b]
呋喃-7-甲酰胺[(±)-1]分别由具有光学活性的 4-乙酰
氨基-2,3-二氢-2-甲基苯并[b]
呋喃-7-
甲酸苄酯[(R)-(+)-6,(S)-(-)-6]制备。所需的(R)-(+)-6 和(S)-(-)-6 是在手性固定相(C
SP)上通过大规模制备高效
液相色谱法制备的。通过单晶 X 射线分析确定了 (S)-(+)-1 的绝对构型。作为(S)-(+)-1的半
富马酸盐的(S)-(-)-1半
富马酸盐(SK-951)的
血清素5-HT4受体激动活性约为作为(R)-(-)-1的半
富马酸盐的另一种对映体(R)-(+)-1半
富马酸盐的两倍。