(<i>Z</i>)-α-Boryl-crotylboron reagents <i>via Z</i>-selective alkene isomerization and application to stereoselective syntheses of (<i>E</i>)-δ-boryl-<i>syn</i>-homoallylic alcohols
作者:Shang Gao、Jichao Chen、Ming Chen
DOI:10.1039/c9sc00226j
日期:——
Stereoselective synthesis of (Z)-α-boryl-crotylboronate is developed. Ni-catalyzed Z-selective alkene isomerization of α-boryl substituted homoallylboronate provided the targeted (Z)-crotylboronate with high selectivity. Stereoselective addition of the novel crotylboron reagent to aldehydes gave (E)-δ-boryl-substituted syn-homoallylic alcohols with excellent diastereoselectivities. The vinyl boronate
开发了( Z )-α-硼基-巴豆基硼酸酯的立体选择性合成。Ni-催化α-硼基取代的高烯丙基硼酸酯的Z-选择性烯烃异构化提供了具有高选择性的目标( Z )-巴豆基硼酸酯。将新型巴豆基硼试剂立体选择性加成到醛中,得到具有优异非对映选择性的( E )-δ-硼基取代的顺式高烯丙醇。产品中的乙烯基硼酸酯单元可直接用于后续的C-C键形成转化,如天然产物nannocystin A和nannocystin Ax的C 1-7片段的合成所示。