Vilsmeier methodology for the synthesis of 3-(2-N-phthaloylacyl)indole derivatives, and its application to the synthesis of the GCDEF rings of diazonamide
摘要:
The synthesis of the GCDEF fragment of diazonamide was achieved using a modified Vilsmeier procedure that allows ready access to 3-(2-N-phthaloylacyl)indole derivatives. (C) 2001 Elsevier Science Ltd. All rights reserved.
realized via tandem reduction and rearrangement. Using TMSOK as the catalyst and (EtO)2MeSiH as the reductant, a series of cyclic imides containing different functional groups were reduced to the corresponding 3-aryl isoquinolines in moderate to good yields. The scenario of the reaction pathway was supposed to involve the reduction of imides to ω-hydroxylactams, which underwent rearrangement in the presence
Metal-free C–N cross-coupling of electrophilic compounds and N-haloimides
作者:Luyan Zhang、Yanru Li、Long-Yi Jin、Fushun Liang
DOI:10.1039/c5ra13708j
日期:——
When DBU is added, the cross-coupling reactionbetweenalkylhalides (halogen = Cl, Br and I) and N-haloimides (halogen = Cl, Br) occurs, resulting in the formation of aminated products. A halogenbond activated nucleophilic substitution mechanism was proposed. The methodology represents an elegant example of applying the halogenbond activation strategy in an organic transformation.
The Morita–Baylis–Hillman reaction for non-electron-deficient olefins enabled by photoredox catalysis
作者:Long-Hai Li、Hao-Zhao Wei、Yin Wei、Min Shi
DOI:10.1039/d1sc06784b
日期:——
Morita–Baylis–Hillman (MBH) reaction, which is only applicable to electron-deficient olefins, has been achieved via visible-light induced photoredox catalysis in this report. A series of non-electron-deficient olefins underwent the MBH reaction smoothly via a novel photoredox-quinuclidine dual catalysis. The in situ formed key β-quinuclidinium radical intermediates, derived from the addition of olefins with quinuclidinium
Photoreactions involving N,N-dimethylated α-amino acid salts and N-methylphthalimide are dominated by photoreduction and acetone trapping. Only, N-phenyl glycinate underwent photodecarboxylative addition in a moderate yield of 30%. In contrast, N-acylated α-amino acid salts readily gave addition products in fair to high yields of 20–95%. Comparison experiments with N,N-dimethylacetamide and amino-/amido-containing