Ligand-Controlled α- and β-Arylation of Acyclic N-Boc Amines
摘要:
AbstractThe palladium‐catalyzed ligand‐controlled arylation of α‐zincated acyclic amines, obtained by directed α‐lithiation and transmetalation, is described. Whereas PtBu3 gave rise to α‐arylated Boc‐protected amines, more flexible N‐phenylazole‐based phosphine ligands induced major β‐arylation through migrative cross‐coupling.
One-pot reductive coupling of N-acylcarbamates with activated alkenes: application to the asymmetric synthesis of pyrrolo[1,2-a]azepin-5-one ring system and (−)-xenovenine
cyclic N-acylcarbamates can be used as stable substrates, and a range of activated alkenes serve as effective radical receptors. The reductive coupling of l-N-acylcarbamates 12/13 gave 2,5-disubstitutedpyrrolidine derivatives in high trans-diastereoselectivities. The reductive coupling with penta-2,4-dienoate proceeded exclusively in a 1,6-addition fashion, producing a single non-conjugated E-isomer
Reactivity and Enantioselectivity in the Reactions of Scalemic Stereogenic α-(<i>N</i>-Carbamoyl)alkylcuprates
作者:R. Karl Dieter、Gabriel Oba、Kishan R. Chandupatla、Chris M. Topping、Kai Lu、Rhett T. Watson
DOI:10.1021/jo035845i
日期:2004.4.1
ine and THF soluble CuCN·2LiCl react with vinyl iodides, vinyl triflates, β-iodo-α,β-enoates, propargyl mesylates, and allyl bromide to afford the substitution products with excellent enantioselectivity. Excellent enantiomeric ratios are obtained in the conjugateaddition reactions with methyl vinyl ketone while low enantiomeric ratios can be achieved with acrylate esters using HMPA/TMSCl activation
A new protocol for protection of aryl and aliphatic amines was developed with (Boc)2O in the presence of β-cyclodextrin in water. A catalytic amount of β-cyclodextrin is specific for activation of amines. This procedure works well on a wide variety of both electron-rich and electron-deficient amines.
Palladium-Catalyzed C(sp<sup>3</sup>)H Arylation of<i>N</i>-Boc Benzylalkylamines via a Deprotonative Cross-Coupling Process
作者:Nusrah Hussain、Byeong-Seon Kim、Patrick J. Walsh
DOI:10.1002/chem.201502017
日期:2015.7.27
intermediates and products in the pharmaceutical industry. Herein we disclose a novel method toward the synthesis of these important compounds viaCH functionalization. Presented is a reversible deprotonation of N‐Boc benzylalkylamines at the benzylic CH with in situ arylation by a NiXantPhos‐based palladium catalyst (50–93 % yield, 29 examples). The method is also successful with N‐Boc‐tetrahydroisoquinolines
This invention relates to compounds that inhibit or modulate the activity of Chk-1 kinase. Also provided are pharmaceutical compositions containing the compounds and the therapeutic uses of the compounds.