标题化合物的一般有效合成,包括用(3,7-二氧杂-r -1-氮杂双环[3.3.0] oct- c -5 (选择性)替代商业α-氯二嗪和氰尿酰氯中的氯描述了-甲氧基基团(Williamson方法)。分析了该新系列衍生物的立体化学,分别以溶液(1 H NMR)相对于固态(X射线衍射)相对于手性形式的中观表现出不同的构象手性。在固态下,指出了一些手性网络的包容能力以及它们的超分子聚集。c -5-di(s)的旋转异构行为之间具有良好的相关性发现处于两个状态的-三)二嗪基氧基甲基。
Multiple approaches are described for the elucidation of the stereochemistry in solution (high-resolution NMR spectroscopy) and in the solid state (X-ray diffractometry) that are based on ab initio calculations (level RHF/6-31G*) of some representative 3,7-dioxa-1-azabicyclo[3.3.0]octanes. The results are presented in terms of conformational analysis, anomeric effects, chelating properties and aggregation
Synthesis of precursors of iodine-labeled multifunctional ligands containing 2-nitroimidazole for the detection of hypoxic tissues and/or tumors
作者:Sophie Monge、Jimmy Sélambarom、Jean Pierre Roque、André A Pavia
DOI:10.1016/s0040-4020(01)01022-5
日期:2001.12
Biocompatible multifunctional ligands with telomeric structure containing 2-nitroimidazole as affinity marker and tosylate as precursor of I-123 radioactive tracer were prepared. Telomerization of appropriate monomers derived from tris(hydroxymethyl)-acrylamido-methane was performed in the presence of dodecanethiol, and either AIBN or tert-butylperoxide. These conjugates are designed to target hypoxic tissues and tumors. (C) 2001 Elsevier Science Ltd. All rights reserved.
Anomeric effects in non-carbohydrate compounds: conformational differences between the oxazolidine rings of a cis-fused bicyclic system
作者:Sophie Monge、Jimmy Sélambarom、Francis Carré、Jean Verducci、Jean-Pierre Roque、André A. Pavia
DOI:10.1016/s0008-6215(00)00093-8
日期:2000.9
Tris-(hydroxymethyl)aminomethane (Tris) can react with benzaldehyde (1:2 molar ratio) to produce cis-2,8-diphenyl-5-hydroxymethyl-1-aza-3,7-dioxabicyclo[3.3.0]octane, the structure of which has been confirmed by nuclear magnetic resonance spectroscopy and X-ray crystallography. The crystal structure showed that both oxazolidine rings A and B are puckered in opposite directions. Ring A exists in an E-3 envelope form with O-3 noticeably down (0.65 Angstrom) the plane of the remaining atoms, whereas ring B adopts the E-7 envelope conformation with the O-7 atom displaced up from the mean reference plane by 0.70 Angstrom. Comparison of bond angles and bond distances showed that both oxazolidine rings A and B exhibit cross endo-anomeric effects resulting from electron delocalization over the bond sequence O-3-C-2-N-1-C-8-O-7. (C) 2000 Elsevier Science Ltd. All rights reserved.