Stereoselective synthesis of β-lactams by condensation of titanium enolates of 2-pyridyl thioesters with imines bearing a chiral auxiliary
作者:Rita Annunziata、Maurizio Benaglia、Mauro Cinquini、Franco Cozzi、Laura Raimondi
DOI:10.1016/s0040-4020(01)85521-6
日期:——
tested as chiral auxiliaries in the stereoselective synthesis of β-lactams by condensation of the titanium enolates of 2-pyridyl thioesters with chiral imines. The amines were selected among the following classes of compounds: benzylic amines, β-aminoalcohols, β-heterosubstituted α-aminoesters. Inexpensive and available in both enantiomeric forms α-methylbenzylamine was identified as the chiral auxiliary
通过2-吡啶基硫酯的烯醇钛与手性亚胺的缩合,β-内酰胺的立体选择性合成中已测试了几种胺作为手性助剂。胺选自以下化合物:苄基胺,β-氨基醇,β-杂取代的α-氨基酯。廉价且可以两种对映体形式获得的α-甲基苄胺被鉴定为手性助剂,通常结合了良好的反应性和令人满意的立体控制水平。为了说明该方法的潜力,制备了肾素抑制剂成分的前体。介绍了立体化学结果的初步合理化。