A new convergent and stereoselective synthesis of 2,5-disubstituted N-acylpyrrolidines
作者:Luca Banfi、Andrea Basso、Giuseppe Guanti、Renata Riva
DOI:10.1016/j.tet.2006.02.073
日期:2006.5
A new synthesis of 2,5-disubstituted N-acylpyrrolidines through an SN2′ reaction promoted by the nitrogen anion of a secondary amide onto an allylic bromide is reported. A moderate stereoselectivity, in favour of the trans heterocycle, was observed during the cyclization of a chiral precursor, while a good stereoselectivity, this time in favour of the cis one, was obtained when the second stereocentre
的2,5-二取代的新合成Ñ通过S -acylpyrrolidines Ñ由仲酰胺的氮阴离子促进到一个烯丙基溴报道2'反应。在手性前体环化过程中观察到适度的立体选择性,有利于反式杂环,而在环化步骤后引入第二个立体中心以得到顺式的立体选择性时,则获得了良好的立体选择性,这有利于顺式。相同的产品。