Double Cycloisomerization as a Novel and Expeditious Route to Tricyclic Heteroaromatic Compounds: Short and Highly Diastereoselective Synthesis of (±)-Tetraponerine T6
作者:Joseph T. Kim、Vladimir Gevorgyan
DOI:10.1021/ol027129t
日期:2002.12.1
Cu-Assisted double cycloisomerization of bis-alkynylpyrimidines afforded the 5-6-5 tricyclic heteroaromatic skeleton. This transformation was used as a key step in the highly diastereoselective totalsynthesis of (+/-)-tetraponerine T6.
Highly Diastereoselective Approach toward (±)-Tetraponerine T6 and Analogues via the Double Cycloisomerization−Reduction of Bis-alkynylpyrimidines
作者:Joseph T. Kim、Jason Butt、Vladimir Gevorgyan
DOI:10.1021/jo049259g
日期:2004.8.1
A new, short, and efficient approach toward tricyclic alkaloids, involving the double cycloisomerization−reduction of bis-alkynylpyrimidines 3a−m, has been developed. The requisite bis-alkynylpyrimidines 3a−m were readily prepared viaregioselective sequential Sonogashira coupling reactions of dibromopyrimidines 1. Bis-alkynylpyrimidines 3a−m were converted into the 5−6−5 tricyclic heteroaromatic cores
Direct Palladium-Catalyzed Alkynylation of N-Fused Heterocycles
作者:Ilya V. Seregin、Victoria Ryabova、Vladimir Gevorgyan
DOI:10.1021/ja072718l
日期:2007.6.1
The first example of direct C−H alkynylation of electron-rich heteroaromatics has been demonstrated. This mild, simple, and general method allows for the efficient synthesis of diverse alkynyl heterocycles. Kinetic isotope effect studies support an electrophilic substitution pathway for this transformation.