Spirodiketopiperazine-based CCR5 antagonist: Discovery of an antiretroviral drug candidate
摘要:
Following the discovery that hydroxylated derivative 3 (Fig. 1) was one of the oxidative metabolites of the original lead 1, it was found that hydroxylated compound 4 possesses higher in vitro anti-HIV potency than the corresponding non-hydroxylated compound 2. Structural hybridation of 4 with the orally available analog 5 resulted in another orally-available spirodiketopiperazine CCR5 antagonist 6a that possesses more favorable pharmaceutical profile for use as a drug candidate. (c) 2010 Elsevier Ltd. All rights reserved.
A novel stereocontrolled synthesis of optically active α-furyl amines and α-furyl carbinols from α,β-aziridine and α,β-epoxy aldehydes using a one-pot aldol reaction–intramolecular enolcyclization is described.
Stereoselective aldol condensation of boron enolates to trans α,β-epoxy aldehydes
作者:Giuliana Righi、Francesca Spirito、Carlo Bonini
DOI:10.1016/s0040-4039(02)00914-0
日期:2002.7
A study on the addition of boronenolates of methyl ketones to trans α,β-epoxy aldehydes is reported. The reaction proceeds with an excellent anti stereoselectivity, consistent with the Felkin–Ahn model, toward the synthesis of hydroxylated compounds with defined stereochemistry.
Study on the stereochemical control of dihydroxylation of vinyl epoxides and their derivatives
作者:Giuliana Righi、Emanuela Mandic’、Gaia Clara Mercedes Naponiello、Paolo Bovicelli、Ilaria Tirotta
DOI:10.1016/j.tet.2012.02.029
日期:2012.4
The results obtained from a study on the stereochemical control in the dihydroxylation of the double bond of vinyl epoxides and their derivatives (bromo derivatives, azido derivatives and vinyl aziridines) are presented herein. A significant diastereoselectivity was observed for the bromo derivatives, azido derivatives and N-protected vinyl aziridines, whereas vinyl epoxides and unprotected vinyl aziridines
Enantioselective organocatalytic epoxidation using hypervalent iodine reagents
作者:Sandra Lee、David W.C. MacMillan
DOI:10.1016/j.tet.2006.07.055
日期:2006.12
A rare example of a hypervalentiodine reagent participating in a 1,4-heteroconjugate addition reaction is reported for the organocatalytic, asymmetric epoxidation of α,β-unsaturated aldehydes using imidazolidinone catalyst 1. Development of an ‘internal syringe pump’ effect via the slow release of iodosobenzene from an iminoiodinane source provides high levels of reaction efficiency and enantiomeric
据报道,使用咪唑烷酮催化剂1可以使α,β-不饱和醛发生有机催化,不对称环氧化,这是参与1,4-杂合物加成反应的高价碘试剂的一个罕见例子。通过从亚碘碘烷源缓慢释放碘代苯来开发“内部注射泵”效应,可在缺电子烯烃的不对称环氧化中提供高水平的反应效率和对映体控制。进行了15 N NMR研究,以阐明在原型氧化剂存在下导致催化剂耗竭的反应途径。这些NMR研究也为亚氨基碘烷作为内部缓释氧化剂的应用提供了机理基础,以规避这些催化剂的消耗途径。
A new, simple, and mild azidolysis of vinylepoxides
A new, simple, and mild regio-and stereocontrolled azidolysis of vinylepoxides with TMSN3/BF3 system is reported. The method appears of general value and works very well particularly in the presence of electron-poor olefins, regardless of the size of substituents on the heterocyclic ring. (C) 2011 Elsevier Ltd. All rights reserved.