Modular Approach to Substituted Boc-Protected 4-(Aminomethyl)pyrroles
作者:Songzhe Han、Samir Z. Zard
DOI:10.1021/ol500544u
日期:2014.4.4
The radical addition of various alpha-xanthyl ketones to Boc-protected azetine gives adducts which, when treated with ammonia or primary amines, furnish 2,4-disubstituted, 2,3,4-trisubstituted, and polycyclic pyrroles having a protected aminomethyl group at position 4. An unusual ring-opening was observed in the case of a cyclobutanone precursor.
Free-Radical Variant for the Synthesis of Functionalized 1,5-Diketones
作者:Kelvin Kau Kiat Goh、Sunggak Kim、Samir Z. Zard
DOI:10.1021/ol402213k
日期:2013.9.20
A free-radical approach for the synthesis of functionalized 1,5-diketones has been accomplished through an effective combination play between alkenylacylphosphonates and keto-xanthates as radical surrogates of enolates and enones, respectively.
Synthetic equivalents of alkynyl and propargyl radicals
作者:Peter Boutillier、Samir Z. Zard
DOI:10.1039/b101751i
日期:——
Radicals derived from β-ketoesters can, depending on the
position of the unpaired electron, represent synthetic equivalents to the
high energy and elusive alkynyl radicals or to the stabilised and
relatively unreactive propargyl radicals by application of the xanthate
transfer reaction followed by nitrosative cleavage of the corresponding
isoxazolinones.