Al(OTf)3 exhibits superior catalyst performance in the Friedel–Crafts‐type benzylation using benzylicphosphate as an electrophile. The reaction can be conducted even with 0.2 mol‐% of the catalyst. Twenty‐one different diarylmethanes are formed. The chemoselective property of the catalyst toward the phosphate group over acetate and bromide is noteworthy.
in good to high yields by coupling N-tosylhydrazones (NTHs) with benzylic phosphates as electrophilic partners. The obtained new catalytic system consisted of PdCl2(CH3CN)2/dppp, LiOtBu as a base, and cyclopentyl methyl ether as a green solvent. In addition, we performed a gram-scale transformation using NTH derivatives and benzylic phosphates having a C sp2–Cl bond. The latter was used as a starting
该研究表明,通过将N-甲苯磺酰腙 (NTH) 与磷酸苄基作为亲电伙伴偶联,可以以良好至高产率获得各种具有高化学选择性的二取代和三取代烯烃。得到的新型催化体系由PdCl 2 (CH 3 CN) 2 /dppp、LiO t Bu为碱、环戊基甲基醚为绿色溶剂组成。此外,我们使用 NTH 衍生物和具有 C sp 2 -Cl 键的苄基磷酸酯进行了克级转化。后者被用作关键中间体进一步后功能化的起点。
Palladium-catalyzed indium-mediated reductive aromatic C−H allylation of N-benzylsulfonimides with allyl esters
作者:Xue-Ting Zhang、Shi-Kai Tian
DOI:10.1039/d3cc00881a
日期:——
electrophiles with allyl electrophiles has been established. A range of N-benzylsulfonimides smoothly participated in the palladium-catalyzed indium-mediated reductive aromatic C–H allylation with various allyl acetates, delivering structurally diverse allyl(hetero)arenes in moderate to excellent yields with good to excellent site selectivity. The use of inexpensive allylesters for the reductive aromatic
Alcohols 1a-g phosphorylation is performed in the Atherton-Todd reaction conditions (mixture of diethylphosphonate and carbone tetrachloride and triethylamine under ultrasonic irradiation). The expected phosphates 2a-g are obtained in good yields.