Synthesis applications of aza-Cope rearrangements. 12. Applications of cationic aza-Cope rearrangements for alkaloid synthesis. Stereoselective preparation of cis-3a-aryloctahydroindoles and a new short route to Amaryllidaceae alkaloids
作者:Larry E. Overman、Leah T. Mendelson、E. Jon Jacobsen
DOI:10.1021/ja00360a014
日期:1983.10
Synthese d'aryl-3a perhydro indolinones-4(A) a partir d'amino-2 aryl-1' vinyl-1 cyclopentanols; application a la synthese de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
合成这些 d'aryl-3a perhydroindolinones-4(A) a partir d'amino-2 aryl-1'vinyl-1 cyclopentanols; 应用 a la 合成 de crinine par l'intermediaire de A avec aryl=benzodioxole-1,3yl-5
Multimetallic Ni- and Pd-Catalyzed Cross-Electrophile Coupling To Form Highly Substituted 1,3-Dienes
作者:Astrid M. Olivares、Daniel J. Weix
DOI:10.1021/jacs.7b13601
日期:2018.2.21
synthesis of highly substituted 1,3-dienes from the coupling of vinyl bromides with vinyl triflates is reported for the first time. The coupling is catalyzed by a combination of (5,5'-bis(trifluoromethyl)-2,2'-bipyridine)NiBr2 and (1,3-bis(diphenylphosphino)propane)PdCl2 in the presence of a zinc reductant. This method affords tetra- and penta-substituted 1,3-dienes that would otherwise be difficult
Synthesis of α,ω‐Bis‐Enones by the Double Addition of Alkenyl Grignard Reagents to Diacid Weinreb Amides
作者:Stefan Wiesler、Michael A. Bau、Thomas Niepel、Sara L. Younas、Hieu‐Trinh Luu、Jan Streuff
DOI:10.1002/ejoc.201901043
日期:2019.9.30
The synthesis of bis‐enones from alkenyl bromides and α,ω‐bis‐Weinreb amides via a double Grignard reaction is reported. The work contains reliable protocols for the double addition and the efficient generation of the required substituted alkenyl Grignard reagents from alkenyl bromide precursors.
Application of the 2-azaallyl anion cycloaddition method to syntheses of (±)-crinine and (±)-6-epicrinine
作者:William H. Pearson、Frank E. Lovering
DOI:10.1016/0040-4039(94)88457-9
日期:1994.12
Transmetalation of the (2-azaallyl)stannane 9 with n-BuLi produced the 2-azaallylanion 12 which underwent an intramolecular cycloaddition with an alkene to give the perhydroindole 10 in 80% yield as a single stereoisomer. Transformation of 10 to 6-epicrinine 2 and crinine 1 was readily accomplished.
sulfonylation/semipinacol rearrangements of allylic alcohols were developed using cheap and stable RSO2Na (R = CF3, Ph) as reagents. Various β-trifluoromethyl and sulfonated ketones were obtained in moderate to excellent yields. This strategy provides a facile, direct, and complementary approach to construct all-carbon quaternary stereocenters. In addition, the reaction has the advantages of being chemical oxidant-free