N-tert-butoxycarbonylation of a variety of aminesusing diphenylglycoluril as organocatalyst has been described. For the first time, a plausible mechanism for the N-tert-butoxycarbonylation has been proposed using density functional theory (DFT) calculations supported by NMR studies. The reusability of the organocatalyst and observation of the desired N-Boc protected amines being formed without the formation
This work presents a visible-light mediated oxidativecleavage of unstrained C−C(sp3) and C−N(sp3) bonds of nitriles, alcohols (diols), and amines using Acr+-Mes/Selectfluor/DMAP system and O2 as the oxidant.
Asymmetric Synthesis of Antimicrotubule Biaryl Hybrids of Allocolchicine and Steganacin
作者:Agnès Joncour、Anne Décor、Jian-Miao Liu、Marie-Elise Tran Huu Dau、Olivier Baudoin
DOI:10.1002/chem.200601764
日期:2007.6.25
its stereochemical information to the biaryl axis. The coupling conditions were optimized, and two biphenylphosphane ligands (DavePhos and S-Phos) were found to give the highest yields and diastereoselectivities. A three-element stereochemical model was proposed to explain the observed diastereoselectivities. In a second key step, the medium ring of the target molecules was formed by a stereoselective