oxaziridination reaction of cyclic diketones with alkyl azides and the subsequent rearrangement of the resulting highly active intermediate, which produces a synthetically challenging chiralbicycliclactam containing a quaternarycarbon center. This procedure not only enriches the copper-nitrene-catalyzed asymmetric reactions, but also provides an alternative strategy to address the inherent challenges of catalytic
Chiral Brønsted Acid-Promoted Enantioselective Desymmetrization in an Intramolecular Schmidt Reaction of Symmetric Azido 1,3-Hexanediones: Asymmetric Synthesis of Azaquaternary Pyrroloazepine Skeletons
The enantioselectivedesymmetrization of 2‐substituted‐2‐azidopropyl 1,3‐hexanediones through an asymmetric intramolecular Schmidt reaction using a chiral Brønsted acid has been developed for the first time. Synthetically interesting pyrroloazepine skeletons with an azaquaternary stereogenic center with up to 59 % ee are accessed effectively (see scheme; R=H, alkyl, or aryl).
首次开发了使用手性布朗斯台德酸通过不对称分子内Schmidt反应对2-取代2-叠氮丙基1,3-己二酮进行对映选择性脱对称。合成有趣的吡咯并ze庚因骨架,其氮杂季铵立体异构中心的ee高达59%(请参阅方案; R = H,烷基或芳基)。
Sulfonium Salt Reagents for the Introduction of Deuterated Alkyl Groups in Drug Discovery
reagents, namely, dn-alkyl sulfonium salts, dn-alkyl halides, a dn-alkyl azide, and a dn-alkyl amine, were prepared and used to efficiently introduce dn-alkyl groups into drug candidates and their analogues with complex skeletons. A liver microsomal metabolism study using 7-(d2-ethoxy)flavone as a model compound revealed a significant deuterium kinetic isotopeeffect due to the installed d2-ethoxy group
制备了多种氘化试剂,即dn-烷基锍盐、 dn-烷基卤化物、 dn-烷基叠氮化物和dn-烷基胺,并用于有效地将dn-烷基引入候选药物中,并它们的类似物具有复杂的骨架。使用 7-( d 2 -乙氧基)黄酮作为模型化合物进行的肝微粒体代谢研究表明,由于安装了d 2 -乙氧基,因此具有显着的氘动力学同位素效应。
Studies of resin acids. 10. Approaches to the synthesis of podocarpic and dehydroabietic acids
作者:J. W. Huffman、P. G. Harris
DOI:10.1021/jo00434a002
日期:1977.7
321. Reduction by dissolving metals. Part VII. The reactivity of mesomeric anions in relation to the reduction of benzene rings