Total Synthesis of (<i>S</i>,<i>S</i>)-Tetramethylmagnolamine via Aerobic Desymmetrization
作者:Zheng Huang、Xiang Ji、Jean-Philip Lumb
DOI:10.1021/acs.orglett.9b03559
日期:2019.11.15
We describe a concise synthesis of the pseudodimeric tetrahydroisoqunoline alkaloid (S,S)-tetramethylmagnolamine by a catalytic aerobic desymmetrization of phenols. Desymmetrization reactions increase molecular complexity with high levels of efficiency, but those that do so by aerobic oxidation are uncommon. Our conditions employ molecular oxygen as an oxygen atom transfer agent and a formal acceptor
Effect of 1-Substitution on Tetrahydroisoquinolines as Selective Antagonists for the Orexin-1 Receptor
作者:David A. Perrey、Nadezhda A. German、Ann M. Decker、David Thorn、Jun-Xu Li、Brian P. Gilmour、Brian F. Thomas、Danni L. Harris、Scott P. Runyon、Yanan Zhang
DOI:10.1021/cn500330v
日期:2015.4.15
Selective blockade of the orexin-1 receptor (OX1) has been suggested as a potential approach to drug addiction therapy because of its role in modulating the brain's reward system. We have recently reported a series of tetrahydroisoquinoline-based OX1 selective antagonists. Aimed at elucidating structure-activity relationship requirements in other regions of the molecule and further enhancing OX1 potency and selectivity, we have designed and synthesized a series of analogues bearing a variety of substituents at the 1-position of the tetrahydroisoquinoline. The results show that an optimally substituted benzyl group is required for activity at the OX1 receptor. Several compounds with improved potency and/or selectivity have been identified. When combined with structural modifications that were previously found to improve selectivity, we have identified compound 73 (RTIOX-251) with an apparent dissociation constant (K-e) of 16.1 nM at the OX1 receptor and >620-fold selectivity over the OX2 receptor. In vivo, compound 73 was shown to block the development of locomotor sensitization to cocaine in rats.
Simplified Tetrandrine Congeners as Possible Antihypertensive Agents with a Dual Mechanism of Action
作者:Patricio Iturriaga-Vásquez、Raquel Miquel、M. Dolores Ivorra、M. Pilar D'Ocon、Bruce K. Cassels
DOI:10.1021/np030022+
日期:2003.7.1
A series of O- and/or N-substituted derivatives of (+/-)-coclaurine (1a) were synthesized as simplified structural mimics of the antihypertensive alkaloid tetrandrine (2) and assayed for binding to brain cortical sites labeled with the alpha(1)-adrenergic radioligand [H-3]prazosin or the calcium channel radioligand [H-3]-diltiazem. The introduction of O-benzyl groups on the coclaurine molecule, which exhibits only adrenergic antagonist activity, led to the appearance of calcium channel blocking activity comparable to that of tetrandrine while retaining adrenolytic activity in the same concentration range. Contraction of aortal rings with noradrenaline or KCl was relaxed more potently by some of these coclaurine derivatives than by tetrandrine, suggesting leads for the development of novel antihypertensive drugs with a dual mechanism of action.
Zarga, Musa H. Abu; Miana, Ghulam A.; Shamma, Maurice, Heterocycles, <hi>1982</hi>, vol. 18, p. 63 - 65
作者:Zarga, Musa H. Abu、Miana, Ghulam A.、Shamma, Maurice