nice complement to our previous report, in which (E)‐β,γ‐unsaturated pyrazoleamides were employed as the prenucleophiles in the copper(I)‐catalyzed asymmetric vinylogous Mannich‐Type reaction and anti‐vinylogous products were obtained. In the previous reaction, copper(I)‐ (1Z,3E)‐dienolates were generated through α‐deprotonation, which might form an equilibrium with (E)‐allylcopper(I) species. Therefore
(E)-α,β-不饱和
吡唑酰胺在
铜(I)-(R)-DTBM-
SEGPHOS催化剂存在下,容易进行二烯化反应,以提供主要的
铜(I)-(1 Z,3 Z)-二
壬酸酯和Et 3 N,它们与醛
亚胺反应,提供顺式vinylogous产品,是高区域和对映体选择性的主要非对映异构体。在某些情况下,非对映选择性很低,这可能是由于
铜(I)-(1 Z,3 Z)-二烯酸酯与
铜(I)-(1 Z,3 E)-二烯酸酯的比率低。(Z)-烯丙基
铜(I)物种被认为是有效的中间体,可能与
铜(I)-(1 Z,3 Z)-二烯酸酯形成平衡。有趣的是,本方法学是对我们先前报告的很好的补充,在该报告中,(E)-β,γ-不饱和
吡唑酰胺被用作
铜(I)催化的不对称
乙烯基类Mannich型反应和反
乙烯基产物中的前亲核试剂。获得了。在之前的反应中,通过α-去质子化反应生成了
铜(I)-(1 Z,3 E)-二烯酸酯,这可能与(E)-烯丙基
铜(I)形成