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