An Ester Enolate–Claisen Rearrangement Route to Substituted 4-Alkylideneprolines. Studies toward a Definitive Structural Revision of Lucentamycin A
作者:Sujeewa Ranatunga、Jinsoo S. Kim、Ujjwal Pal、Juan R. Del Valle
DOI:10.1021/jo201727g
日期:2011.11.4
substituted α-allylglycine products with good to excellent diastereoselectivities. Resolution of dipeptide diastereomers and cyclization to form the pyrrolidine rings provide rapid access to stereopure prolyl dipeptides. We have applied this strategy to the synthesis of four Emp-containing isomers of lucentamycin A in pursuit of a definitive stereochemical revision of the naturalproduct. Our studies indicate