Diruthenium(I,I) Catalysts for the Formation of β- and γ-Lactamsvia Carbenoid CH Insertion of α-Diazoacetamides
作者:Markus Grohmann、Stefan Buck、Lutz Schäffler、Gerhard Maas
DOI:10.1002/adsc.200606108
日期:2006.10
Intramolecular carbenoid CH insertion of five α-diazoacetamides [N2CHCONR2, NR2=NEt2 (3a), NBu2 (3b), N(i-Pr)2 (3c), N(CH2Ph)2 (3d), N(i-Pr)(CH2Ph) (3e)], was investigated using as catalysts dinuclear Ru(I,I) complexes of the type [Ru2(μ-L1)2(CO)4L22], where L1 is a bidentate bridging acetate, calix[4]arenedicarboxylate, saccharinate, pyridin-2-olate, or triazenide ligand, as well as [RuCl2(p-cymene)]2
五个α-重氮乙酰胺[N 2 CHCONR 2,NR 2 = NEt 2(3a),NBu 2(3b),N(i- Pr)2(3c),N(CH 2 Ph)2(3d),N(异PR)(CH 2 PH)(3E)],使用研究作为催化剂的双核钌(I,I)所述类型的复合物的[Ru 2(μ-L 1)2(CO)4大号2 2 ],其中L 1是桥接乙酸盐,杯[4]芳烯二羧酸盐,糖精,吡啶-2-油酸酯或三氮烯配体以及[RuCl 2(p- cymene)] 2的双齿。发现Ru(I,I)配合物是类胡萝卜素环化反应的合适催化剂,除了3a的情况。使用重氮酰胺3b–e,[Ru 2(μ-囊)2(CO)5 ] 2(sa c =糖精)和[Ru 2(μ-6-氯吡啶-2-醇酸酯)2(CH 3 CN)2( CO)4 ]与Rh 2(OAc)4一样有效在相同条件下,尽管观察到环化的区域选择性和化学选择性有些差异。类胡萝卜素环化反应从重氮酰胺3