A highly effective synthetic route to produce donor-acceptor azetines through the highly enantioselective [3+1]-cycloaddition of silyl-protected enoldiazoacetates with aza-ylides using chiral copper(I) catalysis is provided. In one embodiment, the 2-azetidine cycloaddition products undergo generation of 3-azetidinones by reactions with nucleophiles that produce a broad spectrum of peptide products by the retro-Claisen reaction provided by facile strain with high efficacy and complete retention of enantiopurity. This ring opening reaction uncovers a new methodology for the attachment of chiral peptide units to a variety of amines and alcohols, and tolerates a broad scope of nucleophiles including naturally occurring amines, alcohols, amino acids, and other nitrogen based nucleophiles.
本发明提供了一种高效的合成路线,利用手性
铜(I)催化,通过
硅烷基保护的烯偶氮
乙酸酯与氮杂
环丁烷的高对映选择性 [3+1]- 环加成反应,生成供体-受体氮杂
环丁烷。在一个实施方案中,2-氮杂
环丁烷环化产物通过与亲核物反应生成 3-氮杂
环丁酮,该反应通过简易应变提供的逆-克莱森反应生成广谱肽产物,具有高效性并完全保留了对映纯。这种开环反应揭示了将手性肽单元连接到各种胺和醇上的新方法,并可耐受多种亲核剂,包括天然存在的胺、醇、
氨基酸和其他氮基亲核剂。