Enantioselective carbonyl-ene-type cyclization of α-ketoester and 2-substituted vinylsilane catalyzed by a chiral Cu-BOX complex
作者:Haruka Homma、Shinji Harada、Atsushi Nishida
DOI:10.1016/j.tetlet.2018.06.001
日期:2018.7
We developed an enantioselective carbonyl-ene-type cyclization using 2-substituted vinylsilane as a nucleophilic ene moiety catalyzed by a chiral copper-BOX complex. This reaction is the firstexample of enantioselective carbonyl-ene cyclization using a 1,2-disubstituted olefin. This methodology gave chiral indenols with a tetrasubstituted carbon.
Dibenzoanthradiquinone Building Blocks for the Synthesis of Nitrogenated Polycyclic Aromatic Hydrocarbons
作者:Jose I. Martínez、Juan P. Mora-Fuentes、Marco Carini、Akinori Saeki、Manuel Melle-Franco、Aurelio Mateo-Alonso
DOI:10.1021/acs.orglett.0c01536
日期:2020.6.19
A straightforward method for the synthesis of two dibenzo[a,h]anthracene-5,6,12,13-diquinone building blocks is reported. To showcase their usefulness, a series of dibenzo[a,h]anthracene nitrogenated derivatives have been synthesized that show different optoelectronic, redox, and charge transport properties, illustrating their potential as organic semiconductors.
Palladium‐Catalyzed Annulation of 1,2‐Diborylalkenes and ‐Arenes with 1‐Bromo‐2‐[(
<i>Z</i>
)‐2‐bromoethenyl]arenes: A Modular Approach to Multisubstituted Naphthalenes and Fused Phenanthrenes
(Z)‐1,2‐Diaryl‐1,2‐bis(pinacolatoboryl)ethenes underwent double‐cross‐coupling reactions with 1‐bromo‐2‐[(Z)‐2‐bromoethenyl]arenes in the presence of [Pd(PPh3)4] as a catalyst and 3 M aqueous Cs2CO3 as a base in THF at 80 °C. The double‐coupling reaction gave multisubstitutednaphthalenes in good to high yields. Annulation of 1,2‐bis(pinacolatoboryl)arenes with bromo(bromoethenyl)arenes in the presence
(Ž)-1,2-二芳基-1,2-双(频哪醇基硼)ethenes后行双交叉偶联反应用1-溴-2 - [(ż)-2-溴乙烯基]在[钯的存在下芳烃(在80°C下于THF中作为催化剂的PPh 3)4 ]和作为碱的3 M Cs 2 CO 3水溶液。双重偶联反应以良好或高收率得到了多取代萘。在由[Pd 2(dba)3](dba =二亚苄基丙酮)和2-二环己基膦基2',6'-二甲氧基联苯(SPhos)在相同条件下可生产高产量的稠合菲。第一次环偶联发生在溴乙烯基基团区域上。此程序适用于通过使用相应的二溴双[[ Z)-2-溴乙烯基]苯作为二硼烷基偶联伙伴的双环途径轻松合成多取代的蒽,苯并噻吩和二苯并蒽。
Linker Deficiency, Aromatic Ring Fusion, and Electrocatalysis in a Porous Ni<sub>8</sub>-Pyrazolate Network
The cruciform linker molecule here features two designer functions: the pyrazole donors for framework construction, and the vicinal alkynyl units for benzannulation to form nanographene units into the Ni8-pyrazolate scaffold. Unlike the full 12 connections of the Ni8(OH)4(H2O)2 clusters in other Ni8-pyrazolate networks, significant linker deficiency was observed here, leaving about half of the Ni(II)
metal-organic frameworks (MOFs), NiL1 and NiL2, based on Ni8O6-cluster and ditopic pyrazolate linkers, L1 (with rigid alkyne arms) and L2 (with flexible alkyne chains), were prepared. The protonconductivities of these MOFs in pristine form and imidazole-encapsulated forms, Im@NiL1 and Im@NiL2, were measured and compared. Upon introduction of imidazole molecules, the protonconductivity could be increased
制备了两个基于 Ni 8 O 6簇和双位吡唑酯接头的原始金属有机骨架 (MOF) Ni L1和 Ni L2 L1(具有刚性炔烃臂)和L2(具有柔性炔烃链)。测量并比较了这些原始形式和咪唑封装形式的 MOF 的质子电导率 Im@Ni L1和 Im@Ni L2。引入咪唑分子后,质子电导率可以提高 3 到 5 个数量级,并达到高达 1.72 × 10 -2 S/cm(在 98% RH 和 80 °C 下)。此外,无论是否引入咪唑分子,Ni 8 O具有L2的6基 MOF通常比具有L1的 MOF 具有更好的质子传导性,这表明柔性侧臂确实有助于质子传导,这可能是通过建立有效的质子传导通道以及在网络腔内形成高度有序的水/咪唑分子域来实现的. 除了活性 Ni 8 O 6簇之外,调节连接器垂体的灵活性可作为调节/调节 MOF 质子电导率的替代方法。