Synthesis of N,O-acetals by net amide C N bond insertion of aldehydes into N-acyl phthalimides and N-acyl azoles
作者:Robert N. Enright、Jeffrey L. Grinde、Lincoln I. Wurtz、Matthew S. Paeth、Tekoa R. Wittman、Emily R. Cliff、Yessra T. Sankari、Lucas T. Henningsen、Chuchen Tan、Joseph D. Scanlon、Patrick H. Willoughby
DOI:10.1016/j.tet.2016.08.041
日期:2016.10
We found that N-acylphthalimides and several N-acylated azoles are capable of reacting with aldehydes to form O-acyl-N,O-acetals in an apparent amide CN bond insertion. In the context of N-acylphthalimides, the reaction is mediated by substoichiometric amounts of sodium iodide and potassium phthalimide. DFT computations supported a proposed mechanism and provided insights into the effect of the alkali
Enantioselective Synthesis of Polycyclic Nitrogen Heterocycles by Rh-Catalyzed Alkene Hydroacylation: Constructing Six-Membered Rings in the Absence of Chelation Assistance
作者:Xiang-Wei Du、Avipsa Ghosh、Levi M. Stanley
DOI:10.1021/ol501869s
日期:2014.8.1
Catalytic, enantioselective hydroacylations of N-allylindole-2-carboxaldehydes and N-allylpyrrole-2-carboxaldehydes are reported. In contrast to many alkene hydroacylations that form six-membered rings, these annulative processes occur in the absence of ancillary functionality to stabilize the acylrhodium(III) hydrideintermediate. The intramolecular hydroacylation reactions generate 7,8-dihydropyrido[1
报道了N-烯丙基吲哚-2-甲醛和N-烯丙基吡咯-2-甲醛的催化对映选择性加氢酰化。与形成六元环的许多烯烃加氢酰化相反,这些环化过程是在不存在稳定酰基铑(III)氢化物中间体的辅助官能团的情况下发生的。分子内加氢酰化反应以中等至高产率生成具有优异对映选择性的7,8-二氢吡啶并[1,2- a ]吲哚-9(6 H )-酮和 6,7-二氢吲哚嗪-8(5 H )-酮。