An enantioselective organocatalyzed aza-MBH domino process: application to the facile synthesis of tetrahydropyridines
作者:Shinobu Takizawa、Naohito Inoue、Hiroaki Sasai
DOI:10.1016/j.tetlet.2010.11.045
日期:2011.1
A chiral acid–base organocatalyst was found to promote an aza-MBH dominoprocess between α,β-unsaturated carbonyl compounds and N-tosylimines to afford tetrahydropyridine derivatives with high enantioselectivity.
Solvent-free synthesis of N-sulfonylimines using microwave irradiation
作者:András Vass、József Dudás、Rajender S. Varma
DOI:10.1016/s0040-4039(99)00867-9
日期:1999.7
N-Sulfonylimines are prepared expeditiously in a one-pot solventless operation by microwave thermolysis of aldehydes and sulfonamides in the presence of benign reagents, calcium carbonate and montmorillonite K 10 clay.
Octahedron-based redox molecular sieves M -PKU-1 ( M = Cr, Fe): A novel dual-centered solid acid catalyst for heterogeneously catalyzed Strecker reaction
作者:Weilu Wang、Siyu Zhang、Shixiang Hu、Duo Wang、Wenliang Gao、Rihong Cong、Tao Yang
DOI:10.1016/j.apcata.2017.05.030
日期:2017.7
Cr-PKU-1, an octahedron-based redox molecular sieve, was found to be an efficient, environmentally benign and easily recoverable catalyst for the heterogeneously-catalyzed Strecker reaction under the mild conditions. This material was evidenced to be a dual-centered solid acid with a large density of Brönsted acid (borate hydroxyl groups, B-OH) and Lewis acid sites (Cr3+), and therefore showed much
One-Pot Synthesis of <i>Aza</i>-Morita-Baylis-Hillman Adducts via Zinc-Mediated Allylation of 4-Bromocrotonates and Imines
作者:Li-Ming Zhao、Kun Liu、De-Feng Li
DOI:10.1021/acs.joc.9b02434
日期:2019.12.6
as the reaction partners, providing a rapid alternative to the traditional use of α,β-unsaturated carbonyl compounds. The short reaction time, one-pot operation, broad substrate scopes, gram-scale synthesis, and synthetic application exemplified the utility and practicability of this method.
Novel synthesis of 4(5)-monosubstituted imidazoles via cycloaddition of tosylmethyl isocyanide to aldimines
作者:Ronald ten Have、Marco Huisman、Auke Meetsma、Albert M van Leusen
DOI:10.1016/s0040-4020(97)00717-5
日期:1997.8
4(5)-Monosubstituted imidazoles (9) have been prepared via base-induced cycloaddition of tosylmethyl isocyanide (TosMIC) to N-(dimethylsulfamoyl)aldimines (2) or N-tosylaldimines (3). In the first case, N-(dimethylsulfamoyl)imidazoles 8 are the initial reaction products, from which the dimethylsulfamoyl group is readily removed with aqueous HBr. In the second case, the tosyl group of 1-tosylimidazoles