The inexpensive Br2 can serve as a novel Lewis acid catalyst for Friedel–Crafts alkylation of indoles with α,β-unsaturatedketones. Under the catalysis of only 3 mol % of Br2, this Michael addition proceeded smoothly with high efficiency and broad substrate scope. Moreover, theoretical calculations suggested that Br2 possesses only the modest power to activate chalcones and is inferior to most tested
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:——
日期:——
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