A series of optically active bisbenzofuro[2,3-b:3’,2’-e]pyridine (BBZFPy) derivatives was synthesized starting with the readily available (S)- and (R)-1,1’-bi-2-naphthols through a palladium-catalyzed multiple intramolecular C–H/C–H coupling as the key ring-closure step. The effect of terminal tert-butyl substituents on the BBZFPy skeleton was systematically investigated to uncover a unique aggregation-induced
从易于获得的(S)-和(R)-1,1'-bi-2开始合成一系列光学活性的双苯并呋喃并[2,3- b:3',2'- e ]吡啶(BBZFPy)衍生物-萘酚通过钯催化的多个分子内C–H / C–H偶联作为关键的闭环步骤。系统地研究了末端叔丁基取代基对BBZFPy骨架的影响,以揭示固态下独特的聚集诱导的CPL特性增强。还通过单晶X射线分析评估了偶联产物的晶体结构,井然有序的分子间堆叠排列似乎是CPL增强的原因。
Adamantyl-BINOL as platform for chiral porous polymer aromatic frameworks. Multiple applications as recyclable catalysts
diethylzinc to aromatic aldehydes (ee up to 88%). The corresponding heterogenized phosphoric acid (Ad-BINOL-PO2H-PAF) was applied as heterogeneous recyclable organocatalyst for the cascade condensation/amine addition of anthranilamide with aldehydes and transfer hydrogenation reactions obtaining high yields but low enantioselectivity. On the other hand, heterogeneous phosphoric acid (Ad-BINOLs-PO2H-PAF)
在本文中,我们报告了基于金刚烷基-BINOL的手性多孔芳香族聚合物(Ad-BINOL-PAFs)的合成,用于多相催化。Ad-BINOL-OH-PAF(365 m 2 ·g -1 SA BET)是通过4,4'-二溴-O-乙基保护的金刚烷基-BINOL与1,3,5-三苯苯-之间的共价键构建的4',4'',4'''-三硼酸并在[Ti(OiPr)4 ]存在下,可以有效地将二乙基锌不对称加成到芳族醛中(ee高达88%)。相应的杂化磷酸(Ad-BINOL-PO 2H-PAF)被用作多相可循环利用的有机催化剂,用于蒽酰胺与醛的级联缩合/胺加成反应和转移氢化反应,从而获得高收率但对映选择性低。另一方面,非均相磷酸(Ad-BINOLs-PO 2 H-PAF)也用作合成铑(II)配合物的有效磷酸盐配体,铑(II)配合物是苯乙烯环丙烷化的有效催化剂,可提供高收率和高收率的手性环丙烷非对映选择性(> 99%)和中等对映选择性(ee
Nickel-Catalyzed Ring-Opening C–O Functionalization of <i>peri</i>-Xanthenoxanthenes for 8-Substituted Binaphthol Synthesis
Herein, we disclose the Ni-catalyzed ring-opening C–O functionalization of peri-xanthenoxanthenes using Grignard reagents that forms 8-monofunctionalized binaphthols. 1,2-Bis(dicyclohexylphosphino)ethane was the best ligand for alkylations and ICy for arylation. After mechanistic investigations, we assumed that the reaction proceeds via C–O reduction and subsequent C–O functionalization. To verify
Highly selective oxidative cross-coupling of differently substituted 2-naphthols mediated by Cu(II)-tert-butyl amine complexes is described. The “cross”-products are obtained in good to excellent yields and the selectivity up to ⪢90% is observed depending on the substitution of naphthol nuclei. The alternative procedures - the cross-coupling of free naphthols with CuCl(OMe) as well as the coupling