Conjugate addition of lithiated Schöllkopf's bislactim ether to 1E,3E-butadienylphosphonates: Stereocontrolled access to 2,3-anti-4E 2-amino-6-phosphono-4-hexenoic acid derivatives
作者:Vicente Ojea、Susana Conde、María Ruiz、Ma Carmen Fernández、JoséMa Quintela
DOI:10.1016/s0040-4039(97)00888-5
日期:1997.6
Face-selective 1,6-addition of lithiated Schöllkopf's bislactime ether 5 to 4-substituted, 1,4- or 3,4-disubstituted 1E,3E-butadienylphosphonates6a-d allows a direct and stereocontrolled access to semi-rigid AP6 analogues, the 2,3-anti-4E 2-amino-6-phosphono-4-hexenoic acid derivatives 4a-c. The relative stereochemistry was assigned from a NMR study of the cyclic derivative 12c. Ten-membered trans-fused
将锂化的Schöllkopf's bislactime醚5选择性添加到4-取代的1,4或3,4-二取代的1 E,3 E-丁二烯基膦酸酯6a-d上,可以通过面选择性地直接和立体控制地进入半刚性AP6类似物,即2,3-抗-4 E 2-氨基-6-膦酰基-4-己酸衍生物4a-c。从环状衍生物12c的NMR研究确定了相对立体化学。调用十元反式融合的椅子-船状过渡态,以使添加的立体化学结果合理化。