Orthogonal Reactivity in Boryl-Substituted Organotrifluoroborates
摘要:
A method was developed for the hydroboration of alkenyl-containing organotrifluoroborates to generate dibora intermediates. The reactivity differences between organotrifluoroborates and trialkylboranes facilitated the cross-coupling of the borane moiety of these intermediates in a highly chemoselective fashion with aryl halides, leaving the trifluoroborate intact for subsequent transformation. A one-pot hydroboration/two-directional cross-coupling sequence was also demonstrated, providing the fully elaborated products in good yields. These conditions were also amenable in the cross-coupling of trialkylboranes to halo-containing organotrifluoroborates. The stability of the trifluoroborate moiety to these conditions allows simple and efficient strategies for complex molecule construction.
Orthogonal Reactivity in Boryl-Substituted Organotrifluoroborates
摘要:
A method was developed for the hydroboration of alkenyl-containing organotrifluoroborates to generate dibora intermediates. The reactivity differences between organotrifluoroborates and trialkylboranes facilitated the cross-coupling of the borane moiety of these intermediates in a highly chemoselective fashion with aryl halides, leaving the trifluoroborate intact for subsequent transformation. A one-pot hydroboration/two-directional cross-coupling sequence was also demonstrated, providing the fully elaborated products in good yields. These conditions were also amenable in the cross-coupling of trialkylboranes to halo-containing organotrifluoroborates. The stability of the trifluoroborate moiety to these conditions allows simple and efficient strategies for complex molecule construction.
A Hydride Migration Mechanism for the Mo‐Catalyzed <i>Z</i>‐2‐Selective Isomerization of Terminal Alkenes
作者:Sarah E. Jenny、Juan M. Serviano、Ainara Nova、Graham E. Dobereiner
DOI:10.1002/cctc.202301052
日期:2023.12.7
Selective isomerization of terminal alkenes to Z-2-alkenes is challenging because of the thermodynamic preference for E alkenes. This work investigates the mechanism of a Mo catalyst that achieves high Z selectivity for a range of aliphatic alkenes. DFT analysis points to a hydride migration as key to the isomerization process.
由于E烯烃的热力学偏好,末端烯烃选择性异构化为 Z - 2 -烯烃具有挑战性。这项工作研究了 Mo 催化剂对一系列脂肪族烯烃实现高Z选择性的机制。DFT 分析指出氢化物迁移是异构化过程的关键。
Orthogonal Reactivity in Boryl-Substituted Organotrifluoroborates
作者:Gary A. Molander、Deidre L. Sandrock
DOI:10.1021/ja807076d
日期:2008.11.26
A method was developed for the hydroboration of alkenyl-containing organotrifluoroborates to generate dibora intermediates. The reactivity differences between organotrifluoroborates and trialkylboranes facilitated the cross-coupling of the borane moiety of these intermediates in a highly chemoselective fashion with aryl halides, leaving the trifluoroborate intact for subsequent transformation. A one-pot hydroboration/two-directional cross-coupling sequence was also demonstrated, providing the fully elaborated products in good yields. These conditions were also amenable in the cross-coupling of trialkylboranes to halo-containing organotrifluoroborates. The stability of the trifluoroborate moiety to these conditions allows simple and efficient strategies for complex molecule construction.