A general and convenient palladium‐catalyzed oxidative Heck arylation of both N‐protected and N,N‐diprotected allylic amines with arylboronic acids under mild conditions has been developed. The catalyst system, consisting of Pd(OAc)2 (palladium acetate), AgOAc (silver acetate) and KHF2 (potassium hydrogen fluoride), could efficiently catalyze the coupling reaction in acetone without the aid of any
The Conversion of Carbonyl Compounds into Pentadienylamines by a Julia-Kocienski Olefination Procedure
作者:Richard Taylor、Reyhan Bastin、Mélanie Liron
DOI:10.1055/s-2008-1078011
日期:2008.8
Julia-Kocienski olefination has been successfully employed to convert carbonylcompounds into the corresponding Boc-protected 1,3-pentadienyl amines in a C 4 N homologation process. Good to excellent yields are achieved in THF using MHMDS as base to deprotonate the precursor l-phenyl-1H -tetrazol-5-ylsulfone reagent. The nature of the metallic countercation dramatically affects the stereoselectivity
Julia-Kocienski 烯化已成功用于在 C 4 N 同系化过程中将羰基化合物转化为相应的 Boc 保护的 1,3-戊二烯基胺。使用 MHMDS 作为碱使前体 1-苯基-1H-四唑-5-基砜试剂去质子化,在 THF 中实现了良好到极好的产率。金属抗衡阳离子的性质显着影响新形成的烯烃的立体选择性:使用 KHMDS 实现了良好水平的 2E,4E-立体选择性,而 LiHMDS 提供了 2E,4Ζ-二烯基产物的优势。
CONNELL, RICHARD D.;HELQUIST, PAUL;AKERMARK, BJORN, J. ORG. CHEM., 54,(1989) N4, C. 3359-3370
作者:CONNELL, RICHARD D.、HELQUIST, PAUL、AKERMARK, BJORN
DOI:——
日期:——
Enantioselective Synthesis of Functionalized Arenes by Nickel‐Catalyzed Site‐Selective Hydroarylation of 1,3‐Dienes with Aryl Boronates
作者:Justin S. Marcum、Tiffany R. Taylor、Simon J. Meek
DOI:10.1002/anie.202004982
日期:2020.8.10
A catalytic method for the site‐selective and enantioselective synthesis of functionalized arenes by the intermolecular hydroarylation of terminal and internal 1,3‐dienes with aryl pinacolato boronates is reported. The reactions are promoted by 5.0 mol % of a readily available monodentate phosphoramidite‐Ni complex in ethanol, affording a variety of enantioenriched products in up to 96 % yield and