Palladium Alkynyl and Allenylidene Complexes: Very Efficient Precatalysts for C–C Coupling Reactions
作者:Evelyn Wuttke、Bettina Nägele、Bernhard Weibert、Florian Kessler
DOI:10.1021/om200862m
日期:2011.11.28
trans-[(PEt3)2Pd(−C≡CC═O}NR2)2] (NR2 = N(CH2)4 (9b), NMe2 (9c), N(CH2)4O (9d), N(CH2)5 (9e)), trans-[(PiPr3)2Pd(−C≡CC═O}NMe2)2] (11c), and trans-[(PPh3)2Pd(−C≡CC═O}NR2)2] (NR2 = N(CH2)4 (13b), NMe2 (13c), N(CH2)4O (13d)), were synthesized by treating HC≡CC(═O)NR2 with AgNO3 followed by transmetalation of the alkynyl ligand from silver to [PdCl2(PEt3)2], [PdCl2(PiPr3)2], or [PdCl2(PPh3)2], respectively
将BrC≡CC(═O)O-薄荷基(1a)氧化加成到[Pd(PPh 3)4 ]中,得到炔基配合物反式-[Br(PPh 3)2 Pd–C≡CC(═O)O-薄荷基](2a)。随后2a与三氟乙酸盐反应,生成反式-[(F 3 CCOO)(PPh 3)2 Pd–C≡CC(= O)O-薄荷基](3a)。的反应的反式- [BR(PPH 3)2的Pd-C≡CC(= O)NC 4 H ^ 8 ](2B)和10当量的NaI给出反式-[I(PPh 3)2 Pd–C≡CC(= O)NC 4 H 8 ](4b)。在CC偶联反应中,将新型钯配合物3a和4b作为预催化剂的效率与最近发表的阳离子钯烯基亚烷基配合物的效率进行了比较。其他反式-双(炔基)钯配合物,反式-[(PEt 3)2 Pd(-C≡CC= O} NR 2)2 ](NR 2 = N(CH 2)4(9b),NMe 2(9c),N(CH 2)4 O(9d),N(CH