Solid phase methodology on polyamide-kieselguhr resin was used for the synthesis of six analogs of deamino carba-1 or carba-6 oxytocin with non-coded amino acids in position 2, threonine in position 4, ornithine in position 8 and without glycine in position 9. The following analogs were prepared: des-Gly9-[L-Phe(p-Et)2, Thr4, Orn8]deamino-carba-1-oxytocin (I), des-Gly9-[D-Phe(p-Et)2, Thr4, Orn8]deamino-carba-1-oxytocin (II), des-Gly9-[D-Tyr(Et)2, Thr4, Orn8]deamino-carba-1-oxytocin (III), des-Gly9-[L-Phe(p-Et)2, Thr4, Orn8]deamino-carba-6-oxytocin (IV), des-Gly9-[D-Phe(p-Et)2, Thr4, Orn8]deamino-carba-6-oxytocin (V), and des-Gly9-[D-Tyr(Et)2, Thr4, Orn8]deamino-carba-1-oxytocin (VI). All the analogs were found to be strong uterotonic and pressor inhibitors. The highest potency in the uterotonic inhibitory test was exhibited by analog II (pA2 = 8.3) and strongest pressor inhibitor was compound I (pA2 = 7.5).
使用聚酰胺-
硅藻土
树脂的固相方法合成了六种去
氨基卡巴-1或卡巴-6
催产素类似物,其中位置2为非编码
氨基酸,位置4为苏
氨酸,位置8为
鸟氨酸,位置9没有甘
氨酸。制备了以下类似物:去甘
氨酸
9-[L-Phe(
p-Et)
2, Thr
4, Orn
8]去
氨基卡巴-1-
催产素(
I),去甘
氨酸
9-[D-Phe(
p-Et)
2, Thr
4, Orn
8]去
氨基卡巴-1-
催产素(
II),去甘
氨酸
9-[D-Tyr(Et)
2, Thr
4, Orn
8]去
氨基卡巴-1-
催产素(
III),去甘
氨酸
9-[L-Phe(
p-Et)
2, Thr
4, Orn
8]去
氨基卡巴-6-
催产素(
IV),去甘
氨酸
9-[D-Phe(
p-Et)
2, Thr
4, Orn
8]去
氨基卡巴-6-
催产素(
V),以及去甘
氨酸
9-[D-Tyr(Et)
2, Thr
4, Orn
8]去
氨基卡巴-1-
催产素(
VI)。所有类似物均被发现具有强烈子宫收缩和升压抑制作用。在子宫收缩抑制测试中,类似物
II表现出最高效力(p
A2 = 8.3),而最强的升压
抑制剂是化合物
I(p
A2 = 7.5)。