.alpha.-Adrenoceptor reagents. 2. Effects of modification of the 1,4-benzodioxan ring system on .alpha.-adrenoreceptor activity
摘要:
Modification of the 1,4-benzodioxan ring present in RX 781094 has not previously been considered. This paper describes a number of analogues of this ring system, including compounds in which one of the oxygen atoms has been replaced by a methylene group and also those in which the ring size has been changed to give, for example, furan and thiophene derivatives. The dihydrobenzofuranylimidazoline compound 7 is the only analogue possessing presynaptic antagonist potency potency and selectivity comparable to that of 1. In view of this result, a number of derivatives was prepared to determine the structure-activity relationships within this series. Many derivatives, as well as the parent compound 7, were found to possess presynaptic alpha 2-adrenoreceptor antagonist and postsynaptic alpha 1-adrenoreceptor partial agonist properties. Two of the selective presynaptic antagonists, 13 and 14 possess greater potency and selectivity than that possessed by 1. The 5-chloro derivative 25 is twice as potent as after oral administration but only about half as potent when given intravenously.
作为专题“现代合成中的环化策略”的一部分发布 抽象的 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。 提出了一种绿色廉价的方案,用于通过邻烯丙基苯酚的有机催化氧化合成二氢苯并呋喃。使用2,2,2-三氟苯乙酮和H 2 O 2作为氧化系统,导致了一种非常有用的合成方法,其中各种取代的邻烯丙基苯酚均以高收率环化。