3-(Trimethylsilyl)oxetan-2-ones via enantioselective [2 + 2] cycloaddition of (trimethylsilyl)ketene to aldehydes catalysed by methylaluminiomidazolines
Practical Enantioselective Synthesis of β-Lactones Catalyzed by Aluminum Bissulfonamide Complexes
作者:Thomas Kull、René Peters
DOI:10.1002/adsc.200700084
日期:2007.7.2
practical aluminum-bissulfonamide complex catalyzed enantioselective formation of β-lactones by [2+2] cycloaddition of ketene (generated in situ from acetyl bromide by dehydrobromination) with various α-unbranched and -branched aliphatic aldehydes is presented. The methodology offers the advantage of operational simplicity not only as the ligand synthesis requires just a single sulfonylation step from commercially
A Synthesis of the Hypocholesterolemic Agent 1233A Via Asymmetric [2 + 2] Cycloaddition
作者:Brian W. Dymock、Philip J. Kocienski、Jean-Marc Pons
DOI:10.1055/s-1998-2194
日期:1998.11
3-(Trimethylsilyl)oxetan-2-ones via enantioselective [2 + 2] cycloaddition of (trimethylsilyl)ketene to aldehydes catalysed by methylaluminiomidazolines
作者:Brian W. Dymock、Philip J. Kocienski、Jean-Marc Pons
DOI:10.1039/cc9960001053
日期:——
Enantioselective [2 + 2] cycloaddition of (trimethylsilyl)ketene to aldehydes catalysed by methylalumino-imidazolines gives 3-(trimethylsilyl)oxetan-2-ones with up to 83% ee.