In this paper a unique approach to the synthesis of polycyclic ring systems is disclosed. The approach features an intermolecular Diels-Alderreaction followed by an intramolecular Diels-Alderreaction where the regiochemistry of addition is controlled by substituents on the bisdiene and bisdienophile. This methodology has been applied to the synthesis of the fluorenone ring system. An efficient convergent
Synthesis of 4,5,6,7-tetrahydrothieno[3,2-c]pyridines and comparison with their isosteric 1,2,3,4-tetrahydroisoquinolines as inhibitors of phenylethanolamine N-methyltransferase
作者:Gary L. Grunewald、Mitchell R. Seim、Seema R. Bhat、Marc E. Wilson、Kevin R. Criscione
DOI:10.1016/j.bmc.2007.08.066
日期:2008.1
A series of substituted 4,5,6,7-tetrahydrothieno[3,2-c]pyridines (THTPs) was synthesized and evaluated for their human phenylethanolamine N-methyltransferase (hPNMT) inhibitory potency and affinity for the alpha(2)-adrenoceptor. The THTP nucleus was suggested as an isosteric replacement for the 1,2,3,4-tetrahydroisoquinoline (THIQ) ring system on the basis that 3-thienylmethylamine (18) was more potent as an inhibitor of hPNMT and more selective toward the alpha(2)-adrenoceptor than benzylamine (15). Although the isosterism was confirmed, with similar influence of functional groups and chirality in both systems on hPNMT inhibitory potency and selectivity, the THTP compounds proved, in general, to be less potent as inhibitors of hPNMT than their THIQ counterparts, with the drop in potency being primarily attributed to the electronic properties of the thiophene ring. A hypothesis for the reduced hPNMT inhibitory potency of these compounds has been formed on the basis of molecular modeling and docking studies using the X-ray crystal structures of hPNMT co-crystallized with THIQ-type inhibitors and S-adenosyl-L-homocysteine as a template. (c) 2007 Elsevier Ltd. All rights reserved.
15. Researches on acetylenic compounds. Part III. Diene additions to ethynyl ketones
作者:Kenneth Bowden、E. R. H. Jones
DOI:10.1039/jr9460000052
日期:——
Synthesis of 1,4-dien-3-ones and 2-cyclopentenones
作者:Gunhild Kjeldsen、Jes S. Knudsen、Lise S. Ravn-Petersen、Kurt B.G. Torssell
DOI:10.1016/s0040-4020(01)91945-3
日期:——
Nasarow; Nagibina, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1946, p. 83,86