Facile access to 1,3-bis(boryl) dienes to build molecular complexity through cycloadditions
作者:Shannon M. Stephens、Jean M. Bray、Shayne M. Weierbach、Gessica M. Adornato、John A. Schrider、Kyle M. Lambert
DOI:10.1016/j.tetlet.2023.154381
日期:2023.3
An operationally simple method to access 1,3-bis(boryl) dienes from parent 1,3-diones via bis-triflation and a Pd0-catalyzed double Miyaura borylation is described. The prepared 1,3-bis(boryl) dienes are bench-stable and competent in [4+2] cycloadditions with common dienophiles affording diastereoselective access to borylated bicyclo[2.2.2]octenes. The addition of LaCl3·2 LiCl, as a mild Lewis acid
描述了一种通过双三氟化反应和 Pd 0催化的双宫浦硼酸化从母体 1,3-二酮获得 1,3-双(硼基)二烯的操作简单的方法。所制备的 1,3-双(硼基)二烯是稳定的,能够与常见的亲二烯体进行 [4+2] 环加成,从而提供非对映选择性获得硼化双环 [2.2.2] 辛烯。添加 LaCl 3 ·2 LiCl 作为一种温和的路易斯酸有助于改善结果。与更典型的二烯相比,多硼化二烯的详细计算研究进一步确定了这些关键试剂的反应性和稳定性趋势。