Catalytic Electrophilic Thiocarbocyclization of Allenes
作者:Quanbin Jiang、Huimin Li、Xiaodan Zhao
DOI:10.1021/acs.orglett.1c03270
日期:2021.11.19
An efficient approach via catalytic electrophilic thiocarbocyclization of allenes to construct indene-based sulfides with excellent regioselectivities is disclosed. The reactions were carried out at low temperatures by selenide catalysis in the presence of TMSOTf. Not only electrophilic arylthio reagents but also electrophilic alkylthio reagents worked well under these conditions. Furthermore, the
Palladium-catalyzed, ligand-free S N 2’ substitution reactions of organoaluminum with propargyl acetates for the synthesis of multi-substituted allenes
作者:Xuebei Shao、Chang Wen、Gang Zhang、Kangping Cao、Ling Wu、Qinghan Li
DOI:10.1016/j.jorganchem.2018.06.020
日期:2018.9
We describe a convenient method for the synthesis of multi-substituted allenes from SN2′ substitution reactions organoaluminum with propargyl acetates: The SN2′ substitution reaction of organoaluminum (0.4 mmol) with propargyl acetates (0.5 mmol) mediated by PdCl2(dppf) (1 mol%) at 60 °C in THF without ligand could produce multi-substituted allenes in moderate to good yields (up to 98%) and high selectivities
Palladium-catalyzed direct coupling reaction of propargylic alcohols with arylboronic acids
作者:Masahiro Yoshida、Takahiro Gotou、Masataka Ihara
DOI:10.1016/j.tetlet.2004.05.147
日期:2004.7
The direct coupling of propargylic alcohols with arylboronicacids has been achieved using palladium catalyst. Various propargylic alcohols and arylboronicacids can be coupled to afford the corresponding allenic and propargylic arenes, which are selectively produced depending on the substituent on the propargylic alcohol, respectively.
Highly Efficient Synthesis of Allenes from Trimethylaluminum Reagent and Propargyl Acetates Mediated by a Palladium Catalyst
作者:Qing-Han Li、Jung-Yuan Jeng、Han-Mou Gau
DOI:10.1002/ejoc.201403008
日期:2014.12
A series of propargylacetates were prepared and used as propargyl electrophiles for coupling reactions with trimethylaluminum. The simple catalytic system of palladium(II) acetate (1 mol-%) and tri(o-tolyl)phosphine (2 mol-%) worked efficiently for a wide variety of aromatic and aliphatic propargylacetates, producing the substituted allenes in good to excellent yields of up to 94 % in tetrahydrofuran
制备了一系列乙酸炔丙酯并将其用作炔丙基亲电试剂与三甲基铝进行偶联反应。乙酸钯 (II) (1 mol-%) 和三(邻甲苯基)膦(2 mol-%)的简单催化体系对多种芳香族和脂肪族乙酸炔丙酯有效地工作,产生了良好的取代丙二烯在四氢呋喃中的产率高达 94%。该过程简单易行,为合成取代的丙二烯衍生物提供了一种有效的方法。根据实验结果,提出了一种可能的催化循环。
Synthesis of Multisubstituted Allenes via Palladium-Catalyzed Cross-Coupling Reaction of Propargyl Acetates with an Organoaluminum Reagent
We describe a convenient method for the synthesis of multisubstituted allenesfrom cross-coupling of propargylacetates with organoaluminum reagent: The reaction of propargylacetates with 1.2 equivalents of organoaluminum reagentmediated by Pd(PPh 3 ) 2 Cl 2 (1 mol%)/Ph 3 P (2 mol%) and K 2 CO 3 in THF may produce tri- or tetrasubstituted allenes in good to excellent yields (83–94%) and high regioselectivities
我们描述了一种通过乙酸炔丙酯与有机铝试剂的交叉偶联合成多取代丙二烯的简便方法:乙酸炔丙酯与 1.2 当量有机铝试剂的反应由 Pd(PPh 3 ) 2 Cl 2 (1 mol%)/Ph 介导THF 中的 3 P (2 mol%) 和 K 2 CO 3 可以在 60 °C 下在 3-4 小时内以良好到优异的产率 (83–94%) 和高区域选择性(高达 99%)生成三或四取代的丙二烯.