Practical One-Pot and Large-Scale Synthesis of <i>N</i>-(<i>tert</i>-Butyloxycarbonyl)-3-pyrroline
作者:Tammana Rajesh、Shaik Abdul Azeez、Erragunta Naresh、Gutta Madhusudhan、Kagga Mukkanti
DOI:10.1021/op8003037
日期:2009.5.15
N-(tert-Butyloxycarbonyl)-3-pyrroline was prepared with high purity in large scale starting from cis-1,4-dichloro-2-butene via delepine reaction and subsequent cyclization in the presence of potassium carbonate followed by N-Boc protection in methanol. Judicious selection of base and solvent led to the use of a single solvent, i.e., methanol, for cyclization as well as for N-Boc protection to render the one-pot process from compound 2 more practical and greener than the stepwise version.
作者:Meyers, Albert I.、Warmus, Joseph S.、Dilley, Garrett J.、Gillman, Kevin W.、Hart, David J.
DOI:10.15227/orgsyn.073.0246
日期:——
A modified procedure for the preparation of 2,5-dihydropyrrole (3-pyrroline)
作者:Joseph S. Warmus、Garrett J. Dilley、A. I. Meyers
DOI:10.1021/jo00053a053
日期:1993.1
Heterocyclic Lithium Amides as Chiral Ligands for an Enantioselective Hydroxyalkylation with <i>n</i>-BuLi
作者:Nicolas Duguet、Sylvain M. Petit、Philippe Marchand、Anne Harrison-Marchand、Jacques Maddaluno
DOI:10.1021/jo8005396
日期:2008.7.1
Chiralheterocyclic structures based on 3-aminopyrrolidines (3APs), 3-aminotetrahydrothiophens (3ATTs), and 3-aminotetrahydrofurans (3ATFs) have been synthesized. The corresponding lithium amides have been evaluated as chiralligands in the condensation of n-BuLi on o-tolualdehyde. The returned levels of induction were in the 46−80% ee range. The cheap and easily prepared 3ATFLi’s turned out to be