Abstract A novel method for the Michael reaction of indoles to α,β‐unsaturatedketones catalyzed by acidic ionic liquid is reported. We obtained the corresponding products in excellent yields in the presence of [hmim]HSO4. Development of this method has resulted in a new protocol for the synthesis of β‐indolylketones.
Magnetic polyoxometalates (POMs) are obtained by a simple sonication between functionalized magnetic nanoparticles and polyoxometalates. This material can be used not only as a highly active acid catalyst, but also as a catalyst support for chiral amines.
Kan war, Deepika; Rani, Rashmi; Agarwal, Jyoti, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2010, vol. 49, # 9, p. 1290 - 1299
作者:Kan war, Deepika、Rani, Rashmi、Agarwal, Jyoti、Peddinti, Rama Krishna
DOI:——
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Metal-Free Dehydrogenative Double C–H Sulfuration To Access Thieno[2,3-<i>b</i>]indoles Using Elemental Sulfur
synthesis of thieno[2,3-b]indole derivatives. This method combined four C-H σ-bond cleavage reactions of two different kinds of C-H bonds and two C-S σ-bond formation processes. A series of thieno[2,3-b]indoles were obtained starting from 3-benzylindole derivatives with good yields and high regioselectivity, with the elemental sulfur serving as a cheap and readily available sulfur source. Good efficiency
Bromonium salts have been typically but infrequently used in various reactions as good leaving groups or as aryl or vinyl transfer reagents owing to their extremely high nucleofugality. Herein, we report the synthesis of novel, stable bromonium salts and their first catalytic application to the Michael reaction, with excellent product yield (up to 96%).