Visible-light-induced cyanation of aza-Baylis–Hillman adducts: a Michael type addition
摘要:
Visible-light-induced aerobic oxidative cyanation of aza-Baylis-Hillman (aza-BH) adducts providing valuable allylic cyanides in good to excellent yields has been developed. The protocol involves in situ formation of 4 pi conjugated iminium ion intermediates, which undergo cyanation at the gamma-position to afford Michael type adducts. This is the first example of visible-light-induced catalytic functionalization of aza-BH adducts using air (O-2) as an economical and ecosustainable oxidant and TMSCN as a convenient and readily available cyanide source. (C) 2014 Elsevier Ltd. All rights reserved.
Visible-light-induced direct α-C(sp 3 )–H thiocyanation of tertiary amines
作者:Arvind K. Yadav、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2015.10.048
日期:2015.12
eosin Y catalyzedaerobicoxidative α-C(sp3)–H thiocyanation of tertiary amines is reported. The reaction proceeds through visible-light-induced in situ generation of the iminium ion followed by attack of −SCN nucleophile. This is the first example of visible-light-initiated formation of C(sp3)–S bond employing organo-photoredox catalysis. Mild reaction conditions and use of air and visiblelight as the