<i>In situ ortho</i>-lithiation/functionalization of pentafluorosulfanyl arenes
作者:Thanh V. Le、Olafs Daugulis
DOI:10.1039/d1cc06140b
日期:——
ortho-functionalization of pentafluorosulfanyl arenes has been developed. ortho-Lithiation with lithium tetramethylpiperidide at −60 °C in the presence of silicon, germanium, and tin electrophiles affords trapped products in moderate to highyields. Precise temperature regimes and the presence of electrophiles during lithiation are important for successful reactions, since the pentafluorosulfanyl group
已经开发了一种用于五氟硫烷基芳烃的邻位官能化的通用方法。邻-在硅、锗和锡亲电子试剂存在下,在 -60 °C 下用四甲基哌啶锂进行锂化,以中等至高产率提供捕获的产物。锂化过程中精确的温度范围和亲电试剂的存在对于成功的反应很重要,因为五氟硫烷基在高于 -40 °C 的温度下充当有能力的离去基团。氟、溴、碘、可烯醇化的酮、氰基、酯、酰胺和未取代的氨基官能团与反应条件相容。还证明了 2-二甲基甲硅烷基五氟硫烷基苯转化为 2-卤代衍生物,可用作交叉偶联化学中的起始材料。
New Hindered Amide Base for Aryne Insertion into Si–P, Si–S, Si–N, and C–C Bonds
作者:Milad Mesgar、Justin Nguyen-Le、Olafs Daugulis
DOI:10.1021/jacs.8b07064
日期:2018.10.24
general method for a new, hindered lithium diadamantylamide (LDAM) base-promoted insertion of arynes into Si-P, Si-S, Si-N, and C-C bonds is described. Arynes are generated from easily available aryl triflates and halides. Subsequent reaction of the aryne with silylated phosphines, sulfides, or amines affords the insertion products. Furthermore, a one-step synthesis of anthracenes from aryl halides and
描述了一种新的受阻锂二金刚胺 (LDAM) 碱促进芳炔插入 Si-P、Si-S、Si-N 和 CC 键的一般方法。芳烃是由容易获得的芳基三氟甲磺酸酯和卤化物生成的。芳炔与甲硅烷基化膦、硫化物或胺的后续反应提供插入产物。此外,还证明了从芳基卤化物和芳基酮一步合成蒽。氰基、芳基、烷基、三氟甲基、乙烯基、甲氧基、氯、氟甚至甲酰基部分与反应条件相容。与四甲基哌啶锂 (LiTMP) 促进的反应相比,新的氨基化锂提供了更高的产率。此外,LDAM 碱的庞大性基本上抑制了芳炔与碱的反应,允许使用芳基卤化物和三氟甲磺酸酯作为限制试剂。
Lithium 1,1-diadamantylamide (LDAM) base-promoted insertion of arynes into disulfide S–S bonds is described. After generation of arynes from readily available aryl halides and triflates, reactions with diaryl and diisopropyl disulfides afford the insertion products in moderate to excellent yields. Use of 1-cyclohexenyl triflate gave an excellent yield of 1,2-bis(phenylthio)cyclohexene.
Gram-Scale Preparation of Acyl Fluorides and Their Reactions with Hindered Nucleophiles
作者:Michał Barbasiewicz、Michał Tryniszewski
DOI:10.1055/a-1649-5460
日期:2022.3
A series of acyl fluorides was synthesized at 100 mmol scale using phase-transfer-catalyzed halogen exchange between acyl chlorides and aqueous bifluoride solution. The convenient procedure consists of vigorous stirring of the biphasic mixture at room temperature, followed by extraction and distillation. Isolated acyl fluorides (usually 7–20 g) display excellent purity and can be transformed into sterically
Compositions and methods for inducing CD81 dependent antiproliferation and for treating hepatitis C and other disorders
申请人:The Regents of the University of California
公开号:US20040242542A1
公开(公告)日:2004-12-02
Small molecule analogues of 1-aminoadamantane and methods for using such compositions to induce CD81-dependent antiproliferative effects and/or for the treatment of disorders of human or veterinary patients and/or for the manufacture of therapeutic preparations used to treat such disorders.