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.
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.
A Highly Conjunctive β-Keto Phosphonate: Application to the Synthesis of Pyridine Alkaloids Xestamines C, E, and H
作者:Matthieu Corbet、Michiel de Greef、Samir Z. Zard
DOI:10.1021/ol702590f
日期:2008.1.1
The synthesis of a novel beta-keto gamma-xanthyl phosphonate has been achieved. This highly conjunctivereagent has been utilized in a combination of radical and ionic reactions to create new carbon-carbon bonds. Its usefulness was demonstrated by realizing the first total synthesis of naturally occurring pyridine alkaloids xestamines C, E, and H.