多米诺钯催化双O-H键活化形成C-C和C-O键:合成6,6-二烷基-6 H-苯并[ c ]苯并二甲基苯
摘要:
提出了α,α-二烷基-(2-溴芳基)甲醇有效的钯催化多米诺反应为6,6-二烷基-6 H-苯并[ c ]色烯的反应。它们的形成可以通过一个五元的Pd(II)循环来解释,该循环有效地涉及与第二个分子的多米诺骨牌同质偶联,β碳裂解以及最后的分子内布赫瓦尔德-哈特维格环化。这种多米诺骨牌工艺实际上涉及打破五个σ键(2C–Br,2O–H和C–C)和形成两个新的σ键(CC和C–O)。这种机理途径是前所未有的,并进一步说明了过渡金属催化的作用。
多米诺钯催化双O-H键活化形成C-C和C-O键:合成6,6-二烷基-6 H-苯并[ c ]苯并二甲基苯
摘要:
提出了α,α-二烷基-(2-溴芳基)甲醇有效的钯催化多米诺反应为6,6-二烷基-6 H-苯并[ c ]色烯的反应。它们的形成可以通过一个五元的Pd(II)循环来解释,该循环有效地涉及与第二个分子的多米诺骨牌同质偶联,β碳裂解以及最后的分子内布赫瓦尔德-哈特维格环化。这种多米诺骨牌工艺实际上涉及打破五个σ键(2C–Br,2O–H和C–C)和形成两个新的σ键(CC和C–O)。这种机理途径是前所未有的,并进一步说明了过渡金属催化的作用。
Domino [Pd]-Catalysis: One-Pot Synthesis of Isobenzofuran-1(3<i>H</i>)-ones
作者:Lodi Mahendar、Gedu Satyanarayana
DOI:10.1021/acs.joc.6b01396
日期:2016.9.2
An efficient domino [Pd]-catalysis for the synthesis of isobenzofuran-1(3H)-ones is presented. The strategy shows broad substrate scope and is amenable to o-bromobenzyl tertiary/secondary/primary alcohols. Significantly, the method was applied to the synthesis of antiplatelet drug n-butyl phthalide and cytotoxic agonist 3a-[4′-methoxylbenzyl]-5,7-dimethoxyphthalide.
One-pot synthesis of benzoxaborole derivatives from the palladium-catalyzed cross-coupling reaction of alkoxydiboron with unprotected o-bromobenzylalcohols
Under very mild conditions, functionalized benzoxaborole derivatives were prepared in good to excellent yields via a palladium-catalyzed Miyaura borylation reaction of readily available unprotected o-bromobenzylalcohols, and bis(pinacolato)diboron (B2pin2) without the assistance of an acid.
Palladium‐Catalyzed Suzuki Coupling and NIS‐Mediated Dehydrogenative Cylcoetherification: A Concise Approach to 6,6‐Disubstituted 6
<i>H</i>
‐benzo[
<i>c</i>
]chromenes and Total Synthesis of Didehydroconicol
作者:Chander Shekhar、Gedu Satyanarayana
DOI:10.1002/ejoc.202101444
日期:2022.5.13
Herein, we report a concise approach of 6,6-disubstituted 6H-benzo[c]chromenes in a two-step sequence starting from ortho-bromo benzylic alcohols and arylboronic acids, using intermolecular palladium-catalyzed C−C and intramolecular N-Iodosuccinimide (NIS) mediated key C−O bonds construction.
在此,我们报告了一种从邻溴苯甲醇和芳基硼酸开始的两步序列中 6,6-二取代 6 H-苯并[ c ]色烯的简明方法,使用分子间钯催化的 C - C 和分子内N-碘代琥珀酰亚胺 (NIS) 介导了关键的 C-O 键构建。
The vinylogous Catellani reaction: a combined computational and experimental study
In the presence of 5 mol% Pd(OAc)2, 1 equiv. of norbornene, and K2CO3, the reaction of 4-iodo-2-quinolones with tertiary o-bromobenzylic alcohols produced the desired benzopyran-fused 2-quinolones in moderate to high yields. A Catellani-type mechanism involving vinylic C–H cleavage is proposed based on the results of control experiments and density functional theory calculations.
在5mol%Pd(OAc)2的存在下,1当量。降冰片烯和K 2 CO 3的作用下,4-碘-2-喹诺酮与叔邻溴苄醇的反应以中等至高产率产生了所需的苯并吡喃稠合的2-喹诺酮。基于控制实验和密度泛函理论计算的结果,提出了一种涉及乙烯基C–H裂解的Catellani型机理。