Preparation of Butadienylpyridines by Iridium‐NHC‐Catalyzed Alkyne Hydroalkenylation and Quinolizine Rearrangement
作者:Ramón Azpíroz、Ingo Greger、Luis A. Oro、Vincenzo Passarelli、Ricardo Castarlenas、Jesús J. Pérez‐Torrente
DOI:10.1002/chem.202101414
日期:2021.8.16
iridium(I) intermediate Ir(κ2O,O’-BHetA)(IPr)(η2-C7H7N). The cyclometalated IrH(κ2O,O’-acac)(κ2N,C–C7H6N)(IPr) complex efficiently catalyzes the hydroalkenylation of aromatic and aliphatic terminal alkynes and enynes with 2-vinylpyridine to afford 2-(4R-butadienyl)pyridines with Z,E configuration as the major reaction products (yield up to 89 %). In addition, unprecedented (Z)-2-butadienyl-5R-pyridine
铱(I) N-杂环卡宾络合物,其结构式为Ir(κ 2 O,O' -BHetA)(IPr)( η 2 -coe) [BHetA=双杂原子酸根、乙酰丙酮根或乙酸根;IPr=1,3-双(2,6-二异丙基苯基)咪唑啉-2-卡宾;coe=环辛烯]通过用IPr处理Ir(κ 2 O,O' -BHetA)( η 2 -coe) 2配合物制备。这些配合物与 2-乙烯基吡啶反应,通过铱提供氢化铱(III)-烯基环金属化衍生物 IrH(κ 2 O,O' -BHetA)(κ 2 N , C- C 7 H 6 N)(IPr) (I)中间体Ir(κ 2 O,O'- BHetA)(IPr)( η 2 -C 7 H 7 N)。环金属化 IrH(κ 2 O,O' -acac)(κ 2 N,C– C 7 H 6 N)(IPr) 络合物可有效催化芳香族和脂肪族末端炔烃和烯炔与 2-乙烯基吡啶的加氢烯基化反应,得到 2-主要反应产物为Z、E构型的(