and the boron atom might contribute to this stability. UV-vis spectroscopic investigations on 2-(4-isocyanophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2a) were in agreement with the theoretical studies, showing a red-shifted absorption compared with that of phenylisonitrile. The reported strategy allows boronate ester substrates to survive throughout two-step operations. Two of the compounds synthesized
据报道,容易合成异
氰基芳基
硼酸酯。尽管通常认为三配位
硼官能团易受亲核攻击,但是由于存在异
氰基,新发现的三配位异
氰基芳基
硼酸酯是稳定的。使用DFT / B3LYP / 6-31G(d,p)方法进行的理论计算表明,芳基和
硼原子之间的电子离域可能有助于这种稳定性。2-(4-异
氰基苯基)-4,4,5,5-四甲基-1,3,2-二氧杂
硼烷(2a)与理论研究一致,显示与苯腈相比有红移吸收。报道的策略允许
硼酸酯底物在整个两步操作中得以存活。合成的两种化合物已在Ugi和Passerini多组分反应中成功开发出来,提供了相应的产物。另外,还在环境良性条件下制备了两个含
硼四唑。这些结果表明,官能化的
异氰酸酯是稳定的,可以策略性地用作合成构件。