Stereocontrolled sequential functionalization in acyclic systems by exploiting internal 1,2-asymmetric induction — generation of symmetry-related polyamino alcohol motifs
作者:Stephen Hanessian、Wengui Wang、Yonghua Gai
DOI:10.1016/0040-4039(96)01754-6
日期:1996.10
Treatment of acyclic γ-ureido α,β-unsaturated esters with lithium dialkyl or diaryl cuprates leads to the corresponding β,γ-substituted esters with high syn-stereoselectivity. The potassium enolates of these compounds react with trisyl azide or the Davis oxaziridine reagent to give all syn-orientated α-azido esters, or α-hydroxy esters. Mitsunobu inversion with azide ion produces diastereomeric compounds
无环γ -脲基α,β -不饱和酯与锂的二烷基或二芳基铜酸盐导致具有高对应的β,γ取代的酯的治疗顺-stereoselectivity。这些化合物的烯醇钾与叠氮化三甲苯或Davis oxaziridine试剂反应,得到所有顺位取向的α-叠氮基酯或α-羟基酯。用叠氮化物离子进行Mitsunobu转化产生非对映体化合物。该产品是官能化二胺和氨基醇的极好例子,它们也可以迭代方式制备。