Copper Catalyzed Enantioselective Intramolecular Aminooxygenation of Alkenes
作者:Peter H. Fuller、Jin-Woo Kim、Sherry R. Chemler
DOI:10.1021/ja806585m
日期:2008.12.31
methyleneoxy-functionalized dihydroindolines and pyrrolidines. Tetramethylaminopyridyl radical (TEMPO) serves as both the source of the oxygen and the stoichiometric oxidant. These reactions are catalyzed by copper(II) triflate, complexed with (4S,5R)-Bis-Phbox. The unprotected aminoalcohols can be obtained by sequential dissolving metal reductions of the N-S and O-N bonds.
本文报道了铜催化的烯烃的对映选择性分子内氨基氧化。这是对映选择性分子内烯烃氨基氧化过程的第一份报告。N-Arylsulfonyl-2-allylanilines 和 4-pentenylarylsulfonamides 以高产率和良好的对映选择性环化,提供新的手性亚甲氧基官能化二氢二氢吲哚和吡咯烷。四甲基氨基吡啶基(TEMPO)既是氧源又是化学计量氧化剂。这些反应由与 (4S,5R)-Bis-Phbox 络合的三氟甲磺酸铜 (II) 催化。未保护的氨基醇可以通过连续溶解 NS 和 ON 键的金属还原来获得。
Enantioselective Synthesis of 2-Bromomethyl Indolines via BINAP(S)-Catalyzed Bromoaminocyclization of Allyl Aniline
作者:Sheng-Nan Yu、Yin-Long Li、Jun Deng
DOI:10.1002/adsc.201700106
日期:2017.7.17
An enantioselective bromoamination of allyl aniline with N‐bromosuccinimide (NBS) catalyzed by BINAP(S) (BINAP monosulfide) is described. This protocol could provide a range of chiral 2‐bromomethyl indolines in good to excellent yields with up to 87% ee. Furthermore, the resulting chiral 2‐bromomethyl indolines could be easily converted into synthetically useful chiral building blocks.
A concise synthesis of a benzimidazole analogue of mycophenolic acid using a BF3-Et2O catalyzed amino-claisen rearrangement.
作者:Gaifa Lai、Wayne K. Anderson
DOI:10.1016/s0040-4039(00)91811-2
日期:1993.10
A nine-step synthesis of the benzimidazole analogue, 2, of mycophenolicacid is reported involving both the BF3-Et2O catalysed aromatic amino- and the ortho ester Claisen rearrangements as key steps.
Boron trifluoride-diethyl ether complex (BF3⋅OEt2) was demonstrated to be an efficient catalyst for the amino-Claisen rearrangements of various aromatic N-allylamines into the corresponding o-allylamines in moderate yields.
Cp*Rh(III)-Catalyzed Low Temperature C–H Allylation of N-Aryl-trichloro Acetimidamide
作者:Suvankar Debbarma、Sourav Sekhar Bera、Modhu Sudan Maji
DOI:10.1021/acs.joc.6b02150
日期:2016.12.2
directing group for the directed C–H-allylation reactions. Depending on the allylatingagent used, selectively either mono- or diallylated products were readily synthesized. Moreover, the trichloro acetimidamide directing group was found to be highly efficient even at lower temperature for the C–H-allylation reaction. Due to mildness of the reaction conditions, double bond isomerization or cyclization