Stereoselective Synthesis of Quaternary Center Bearing Azetines and Their β-Amino Acid Derivatives
作者:Christopher J. MacNevin、Rhonda L. Moore、Dennis C. Liotta
DOI:10.1021/jo7018202
日期:2008.2.1
We describe here the use of a stable, four-membered azetine heterocycle for the preparation of highly substituted β-amino acid derivatives. Imidazolidinone chiral auxiliaries were found to eliminate a competitive reaction pathway that had been present under previously reported conditions for azetine synthesis. The ephedrine derived imidazolidin-2-one 21 was allowed to react as its chlorotitanium enolate
Ambhaikar, Narendra B.; Herold, Marike; Liotta, Dennis C., Heterocycles, 2004, vol. 62, p. 217 - 222
作者:Ambhaikar, Narendra B.、Herold, Marike、Liotta, Dennis C.
DOI:——
日期:——
Diastereoselective Addition of Chlorotitanium Enolate of <i>N</i>-Acyl Thiazolidinethione to <i>O</i>-Methyl Oximes: A Novel, Stereoselective Synthesis of α,β-Disubstituted β-Amino Carbonyl Compounds via Chiral Auxiliary Mediated Azetine Formation
作者:Narendra B. Ambhaikar、James P. Snyder、Dennis C. Liotta
DOI:10.1021/ja029871u
日期:2003.4.1
thiazolidin-2-thiones to O-methyl aldoximes. The “anti” azetines can be subsequently converted to the corresponding α,β-disubstituted β-amino carbonyl compound with retention of stereochemistry. The formation of azetine and the product of its “hydrolytic” opening has been confirmed by X-ray crystallographic analyses.