Asymmetric Synthesis of a<i>β</i>-Lactam Framework via the Conjugate Addition of Amidocuprates(I) to Chiral Enoates
作者:Naoki Asao、Tadao Uyehara、Naofumi Tsukada、Yoshinori Yamamoto
DOI:10.1246/bcsj.68.2103
日期:1995.8
Amidocuprate(I) reagents Li[Cu(NR2)2]} and higher order cyanocuprates(I) Li2[Cu(CN)(NR2)2]} have been developed as a new class of nitrogen nucleophiles. These reagents underwent regioselective 1,4-additions to α,β : γ,δ-dienoates, whereas NHR2 gave a 1,6-addition product and the lithium reagent LiNR2 afforded a mixture of 1,4- and 1,2-addition products. The amidocuprates(I) were added to chiral α
酰胺铜酸盐(I)试剂Li[Cu(NR2)2]}和更高阶氰铜酸盐(I)Li2[Cu(CN)(NR2)2]}已被开发为一类新的氮亲核试剂。这些试剂对 α,β: γ,δ-二烯酸酯进行区域选择性 1,4-加成,而 NHR2 产生 1,6-加成产物,锂试剂 LiNR2 产生 1,4- 和 1,2-加成产物的混合物. 将酰氨基铜酸盐 (I) 添加到手性 α,β : γ,δ-二烯酮中,该二烯酮具有 8-苯基-p-薄荷-3-基或 10,2-冰片磺胺手性助剂,以在其中产生 1,4-加合物良好到高的非对映选择性。将 Li[CuN(Bn)(TMS)}2] 和 Li2[Cu(CN)N(Bn)(TMS)}2] 添加到 8-phenyl-p-menth-3-yl 5-phenyl -2,4-戊二烯酸酯或 N-(5-苯基-2,4-戊二烯酰基)-10,2-冰片磺舒坦在 β-位产生 (R)-手性。Li2[Cu(CN)N(Bn)(TMS)}2]