Flow synthesis of organic azides and the multistep synthesis of imines and amines using a new monolithic triphenylphosphine reagent
作者:Catherine J. Smith、Christopher D. Smith、Nikzad Nikbin、Steven V. Ley、Ian R. Baxendale
DOI:10.1039/c0ob00813c
日期:——
Here we describe general flow processes for the synthesis of alkyl and aryl azides, and the development of a new monolithic triphenylphosphine reagent, which provides a convenient format for the use of this versatile reagent in flow. The utility of these new tools was demonstrated by their application to a flow Staudinger aza-Wittig reaction sequence. Finally, a multistep aza-Wittig, reduction and
Facile synthesis of 1,4-benzodiazepin-3-ones from o-bromobenzylamines and amino acids via a cascade coupling/condensation process
作者:Hexiang Wang、Yongwen Jiang、Kun Gao、Dawei Ma
DOI:10.1016/j.tet.2009.06.104
日期:2009.10
with DPPA) provides 1,4-benzodiazepin-3-ones in moderate yields. Using l-proline and l-valine as the starting materials enantiopure products are obtained although partial racemization occurs for other amino acids.
Silver oxide mediated novel SET oxidative cyclization: stereoselective synthesis of 3-azabicyclo[<i>n</i>.1.0]alkanes
作者:Kirana Devarahosahalli Veeranna、Kanak Kanti Das、Sundarababu Baskaran
DOI:10.1039/c9cc03647d
日期:——
For the first time, silver oxide catalyzed SET-oxidative cyclization of an α-amidinoester tethered with an alkene, leading to a novel cyclopropane-fused cyclic amidine, has been developed. This efficient method permits easy access to the pharmaceutically important 3-azabicyclo[n.1.0]alkane framework, having a quaternary centre. The generality of SET oxidative cyclization using persulfate as a co-oxidant
Selective hydrosilylation of N-allylimines using a (3-iminophosphine)palladium precatalyst
作者:Hosein Tafazolian、Joseph A. R. Schmidt
DOI:10.1039/c5cy01859e
日期:——
Hydrosilylation utilizing a (3-iminophosphine)palladium catalyst leads to the selective reduction of the imine unit of allylimines.
利用(3-亚磷腙基)钯催化剂进行氢硅烷基化反应,可以选择性地还原烯丙基亚胺中的亚胺基团。
Experimental and Computational Study of 6-<i>exo</i> and 7-<i>endo</i> Cyclization of Aryl Radicals Followed by Tandem S<sub><i>RN</i></sub>1 Substitution
作者:Lucas E. Peisino、Adriana B. Pierini
DOI:10.1021/jo4001788
日期:2013.5.17
novel substituted 2-acetyl-1,2,3,4-tetrahydroisoquinolines and substituted 2-acetyl-2,3,4,5-tetrahydro-1H-benzo[c]azepines were obtained in good yields. These reactions are proposed to occur through the intermediacy of aryl radicals, which by intramolecular 6-exo or 7-endo attack to a double bond cyclize to give aliphatic radicals, which react along the propagation steps of the SRN1 chain cycle to afford
在亲核试剂Me 3 Sn –,Ph 2 P –和O 2 NCH 2 –的照射下,在液氨中研究了N-烯丙基-N-(2-卤代苄基)-乙酰胺和衍生物的反应。按照该程序,以高收率获得了新颖的取代的2-乙酰基-1,2,3,4-四氢异喹啉和取代的2-乙酰基-2,3,4,5-四氢-1 H-苯并[ c ]氮杂。这些反应被认为是通过芳基自由基的中间发生的,而芳基自由基的发生是通过分子内的6- exo或7- endo攻击双键环化得到脂族基团,这些脂族基团沿着S RN 1链环的传播步骤反应,得到环状取代的化合物作为主要产物。使用DFT方法对反应进行建模,该方法提供了合理的理解,可以将产物分布与作为中间体的脂肪族自由基的结构及其形成的动力学联系起来。