A Synthesis of Enantiomerically Pure 3- and 3,3-Disubstituted Pyrrolidines
摘要:
Enantiomerically pure bicyclic lactam 1, derived from (S)-phenylglycinol, underwent diastereoselective mono- and dialkylation affording substituted lactams 2 and 3 bearing tertiary and quaternary stereocenters. Reduction with LiAlH4 furnished N-(2'-hydroxy-1'-phenylethyl) pyrrolidines 4 which were efficiently debenzylated by catalytic hydrogenolysis to afford enantiomerically pure 3-mono- and 3,3-disubstituted pyrrolidines 5.
2-Aminomethylthieno[3,2- d ]pyrimidin-4(3 H )-ones bearing 3-methylpyrazole hinge binding moiety: Highly potent, selective, and time-dependent inhibitors of Cdc7 kinase
a serendipitously-identified Cdc7 inhibitor 2b with a 3-methylpyrazole resulted in a 4-fold increase in potency and acceptable kinase selectivity, leading to the identification of thieno[3,2-d]pyrimidin-4(3H)-one as an alternative scaffold. Structure-activity relationship (SAR) study revealed that incorporation of a substituted aminomethyl group into the 2-position improved kinase selectivity. Indeed
Catalyst-free photo-induced aerobic radical synthesis of lactams from <i>N</i>-alkenyl trichloroacetamides in 2-methyltetrahydrofuran as the radical initiator under violet light
作者:Faïza Diaba、Gisela Trenchs
DOI:10.1039/d3ob01804k
日期:——
The first violet light-mediated synthesis of γ- and δ-lactams from N-alkenyl trichloroacetamides is reported in tetrahydrofuran or 2-methyltetrahydrofuran alone. These catalyst and additive-free reactions are achieved with non-anhydrous solvents and under an air atmosphere where the solvent serves as the radical initiator.
Optimization of (4,4-difluoro-1,2,3,4-tetrahydro-5H-1-benzazepine-5-ylidene)acetamide derivatives as arginine vasopressin V2 receptor agonists and discussion of their binding modes
A series of (4,4-difluoro-1,2,3,4-tetrahydro-5H-1-benzazepine-5-ylidene)acetamide derivatives were optimized to achieve potent agonistic activity, both in vitro and in vivo, for the arginine vasopressin V-2 receptor, resulting in the eventual discovery of compound 1g. Molecular modeling of compound 1g with V-2 receptor was also examined to evaluate the binding mode of this series of compounds. (C) 2009 Elsevier Ltd. All rights reserved.
Ringdahl, Bjoern, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1984, vol. 38, # 2, p. 141 - 152
作者:Ringdahl, Bjoern
DOI:——
日期:——
Diastereoselective 5-exo-trig radical cyclisation on N-Acryloyl-tetrahydro-1,3-oxazines. A novel approach to enantiopure 3-substituted pyrrolidines
作者:Celia Andrés、J.Pablo Duque-Soladana、Jesús M. Iglesias、Rafael Pedrosa
DOI:10.1016/s0040-4039(96)02091-6
日期:1996.12
N-Acryloyl-2-(phenylselenomethyl)-tetrahydro-1,3-oxazine 1 generates a carbon-centred radical in the presence of tri-n-butyltin hydride and AIBN. This radical underwent diastereoselective 5-exo-trig cyclisation leading to a mixture of five-membered lactams 2a and 2b (d.e. 68%). Chromatographic separation of the diastereomers and elimination of the chiral auxiliary provided enantiopure (R)-3-methylpyrrolidine in good chemical yield. Copyright (C) 1996 Elsevier Science Ltd