Use of azalactones in a “Pictet-Spengler-like” reaction. Stereoselective synthesis of 1,3,4-substituted tetrahydro-β-carbolines
作者:Jesús Ezquerra、Carlos Lamas、Alfredo Pastor、Pilar Alvarez、Juan José Vaquero、Will G Prowse
DOI:10.1016/0040-4039(96)01233-6
日期:1996.8
A “Pictet-Spengler-like” reaction between azalactones 1 and conformationally constrained tryptamines 4 in refluxing 1N HCl over 72 h. gave the corresponding tetrahydro-β-carbolines 3 in moderate to good yields. The observed equatorial orientation of the C-1 substituent in the THBC's results from a combination of the thermal reaction conditions and conformational constraints imposed by the starting
Conformationally constrained serotonin analogues: Stereoselective synthesis of trans-3-(2-aminocycloalkyl)indoles by aziridine ring opening
作者:Jesús Ezquerra、Concepción Pedregal、Carlos Lamas、Alfredo Pastor、Pilar Alvarez、Juan José Vaquero
DOI:10.1016/0040-4039(95)02242-2
日期:1996.1
Trans-3-(2-aminocyclopentyl)indoles9a,c and trans-3-(2-aminocyclohexyl)indoles9b,d have been stereoselectively prepared by nucleophilic ringopening reaction of N-Boc cycloalkylaziridines 6a,b and the “lower order” magnesium cuprate II, generated from the corresponding indolilmagnesium bromides derived from 7a,b.
An approach to the synthesis of 5,5-trans-fused lactam analogues of β-lactam antibiotics
作者:Paul W. Smith、Andrew R. Whittington、Kevin N. Cobley、Albert Jaxa-Chamiec、Harry Finch
DOI:10.1039/b007286i
日期:——
A racemic synthesis of two diastereoisomeric α-benzyloxycarbonylamino substituted trans-fused bicyclic lactams (4 and 5), was achieved from cyclopentene oxide. These lactams are useful intermediates to investigate the possibility of using a trans-lactam template as a replacement for the β-lactam ring found in conventional antibacterial agents. One of the intermediates (4) was further elaborated to an analogue of the antibacterial agent ceftazidime.
Stereoselective synthesis of 1,3,4-substituted tetrahydro-β-carbolines from indoles based on selective transformations
作者:Jesús Ezquerra、Concepción Pedregal、Carlos Lamas、Alfredo Pastor、Pilar Alvarez、Juan José Vaquero
DOI:10.1016/s0040-4020(97)00489-4
日期:1997.6
nucleophilic aziridine ring opening with a lower order indolyl magnesium cuprate obtaining the α,β-substituted tryptamines 5 and secondly, a “Pictet-Spengler-like” reaction between azalactones 12 and tryptamines 5. Under the acidic reaction conditions used, the thermodynamically favoured tetrahydro β-carbolines 4 are obtained due to the conformational restrictions imposed by the tryptamine substituents
α-Human thrombin is a potent platelet agonist involved in the blood coagulation cascade and is an attractive target for an anticoagulant agent due to its involvement in several debilitating diseases. In this contribution we present attempts to develop a new architecture for size-selective serine protease inhibitors that utilize a fully methylated icosahedral p-carborane as a dominating hydrophobic pharmacophore. Using a computational docking program, flexX, a carborane-containing inhibitor was designed and synthesized. Computationally, this compound displayed the ability to provide ligand-protein binding interactions throughout the thrombin’s main active site (S1-S3), while positioning an acylating group for facile irreversible attack at the Ser195 hydroxyl group.