An Efficient Method for the Synthesis of [4–15N]Cytidine, 2′-Deoxy[4–15N]Cytidine, [6–15N]adenosine, and 2′-Deoxy [6–15N]adenosine Derivatives
摘要:
Nucleophilic substitution reactions of 4-azolyl-1-beta-D-ribofuranosyl-pyrimidin-2(1H)-one and 6-azolyl-9-beta-D-ribofuranosyl-9H-purine derivatives, which were converted from uridine and inosine, with [N-15]phthalimide in the presence of triethylamine or DBU gave N-4-phthaloyl[4-N-15]cytidine and N-6-phthaloyl[6-N-15]- adenosine derivatives, respectively, in high yields. Similar reactions of those azolyl derivatives with succinimide afforded N-4-succinylcytidine and N-6-succinyladenosine derivatives in high yields. The corresponding 2'-deoxyribonucleosides were also synthesized efficiently through the same procedure.
Enediolate–Dilithium Amide Mixed Aggregates in the Enantioselective Alkylation of Arylacetic Acids: Structural Studies and a Stereochemical Model
作者:Yun Ma、Craig E. Stivala、Ashley M. Wright、Trevor Hayton、Jun Liang、Ivan Keresztes、Emil Lobkovsky、David B. Collum、Armen Zakarian
DOI:10.1021/ja403076u
日期:2013.11.13
reactivities of intervening aggregates underlying highly selective asymmetric alkylations of carboxylic acid dianions (enediolates) mediated by the dilithium salt of a C2-symmetric chiral tetraamine. Crystallography shows a trilithiated n-butyllithium-dilithiated amide that has dimerized to a hexalithiated form. Spectroscopic studies implicate the non-dimerized trilithiated mixed aggregate. Reaction of the
X 射线晶体学、(6)Li、(15)N 和 (13)C NMR 光谱以及密度泛函理论计算相结合,可以深入了解羧酸双阴离子高选择性不对称烷基化背后的干预聚集体的结构和反应性(烯二醇酯)由 C2 对称手性四胺的二锂盐介导。晶体学显示三锂化的正丁基锂-二锂化酰胺已二聚成六锂化形式。光谱研究表明非二聚化三锂混合聚集体。二锂化酰胺与衍生自苯乙酸的烯二醇二锂的反应提供了由溶液中的两个双阴离子和固态的二聚八硫代形式组成的四硫代聚集体。计算研究揭示了溶液结构的细节,并提供了高度预测的立体化学模型。
Asymmetric Induction by a Nitrogen<sup>14</sup>N/<sup>15</sup>N Isotopomer in Conjunction with Asymmetric Autocatalysis
usually not considered a source of chirality in a chemical reaction. An N2,N2,N3,N3‐tetramethyl‐2,3‐butanediamine containing nitrogen (14N/15N) isotope chirality was synthesized and it was revealed that this isotopically chiral diamine compound acts as a chiral initiator for asymmetric autocatalysis.
Efficient Preparation of [1-15N]-3-Cyano-4-methyl-1H-pyrrole by a Wittig-Based Strategy
作者:Prativa B. S. Dawadi、Johan Lugtenburg
DOI:10.1002/ejoc.200800079
日期:2008.5
3-Cyano-4-methyl-1H-pyrrole (1) was prepared by a new Wittig procedure from simple, commercially available starting materials in four steps with an overall yield of 39 %. Similarly, [1-15N]-3-cyano-4-methyl-1H-pyrrole (1a) was prepared starting from [15N]-phthalimide. In this synthesis, Wittig coupling was used to form the central C–C bond of intermediate 6, which has nitrile and methyl substituents
6-azolyl-9-β-D-ribofuranosyl-9H-purine derivatives, which were converted fromuridine and inosine, with [15N]phthalimide in the presence of triethylamine or DBU were found to give [4-15N]-N4-phthaloylcytidine and [6-15N]-N6-phthaloyladenosine derivatives, respectively, in high yields, while reactions with succinimide also afforded N4-succinylcytidine and N6-succinyladenosine derivatives, in high yields.
[EN] ISOTOPOLOGUES OF LENALIDOMIDE<br/>[FR] ISOTOPOLOGUES DE LÉNALIDOMIDE
申请人:CELGENE CORP
公开号:WO2010093434A1
公开(公告)日:2010-08-19
provided herein are lenalidomide, which is enriched with isotopes such as deuterium. Pharmaceutical compositions comprising the isotopes-enriched compounds, and methods of using such compounds are also provided.