Suzuki–Miyaura cross-couplings of secondary allylic boronic esters
作者:Ben W. Glasspoole、Kazem Ghozati、Jonathon W. Moir、Cathleen M. Crudden
DOI:10.1039/c2cc16076e
日期:——
Palladium-catalyzed cross-coupling reactions of secondary allylic boronic esters with iodoarenes were demonstrated under the conditions previously described for the coupling of benzylic substrates. The regioselectivity of the process was largely dictated by the pattern of olefin substitution.
Ligand controlled cobalt catalyzed regiodivergent 1,2-hydroboration of 1,3-dienes
作者:Sihan Peng、Ji Yang、Guixia Liu、Zheng Huang
DOI:10.1007/s11426-018-9418-7
日期:2019.3
Regiodivergent 1,2-hydroboration of 1,3-dienes with pinacolborane has been accomplished by well-defined cobalt complexes of different bidentate ligands. The iminopyridine-cobalt system is selective for Markovnikov 1,2-hydroboration to form allylboronates, while the FOXAP-cobalt (FOXAP=(S)-1-(diphenylphosphino)-2-[(S)-4-isopropyloxazolin-2-yl]ferrocene) catalyst effects the complementary anti-Markonikv 1,2-hydroboration to afford homoallyboronates with high regioselectivity.
Nickel-catalyzed Markovnikov 1,2-Hydroboration of In Situ Generated 1,3-Dienes Using a Secondary Homoallylic Carbonate as the 1,3-Diene and Hydride Source
regioselective hydroboration of 1,3-dienes has been received continuous interests in the field of organic synthesis. Herein, we describe the nickel-catalyzed Markovnikov 1,2-hydroboration of in situgenerated1,3-dienes with bis(pinacolato)diboron using a secondary homoallyic carbonate as the 1,3-diene and hydridesource. The catalytic hydroboration of in situgenerated1,3-dienes proceeded in the presence
过渡金属催化的1,3-二烯的区域选择性硼氢化反应在有机合成领域一直受到关注。本文中,我们描述了使用仲均碳酸酯作为1,3-二烯和氢化物源,用双(频哪醇)二硼原位生成的1,3-二烯进行镍催化的Markovnikov 1,2-氢硼化反应。在存在Ni(cod)2 / P(p -MeOC 6 H 4)3作为催化剂的情况下,原位生成的1,3-二烯催化加氢硼化反应以42-77%的收率得到相应的仲烯丙基硼酸酯,高选择性(12个例子)。