Michael Additions to (R)-1-Acetyl-5-isopropoxy-3-pyrrolin-2-one and Subsequent N-Acyliminium Ion Generation: Synthesis of Enantiopure 1-Azabicycles and Preparation of an Intermediate for a Projected Synthesis of Roseophilin
Enantioselective Formal Total Synthesis of Roseophilin
作者:Samantha J. Bamford、Tim Luker、W. Nico Speckamp、Henk Hiemstra
DOI:10.1021/ol005750s
日期:2000.4.1
text] An enantioselectiveformal total synthesis of roseophilin 3 is presented. The 13-membered ring of macrotricycle 1 was formed via an efficient ring-closing metathesis reaction of bicycle 4. A palladium-catalyzed methoxycarbonylation reaction of enol triflate 5 was utilized to functionalize the right-hand ring of bicycle 2. The allyl substituent was introduced by a radical allylation of alpha-bromoketone
Michael Additions to (<i>R</i>)-1-Acetyl-5-isopropoxy-3-pyrrolin-2-one and Subsequent <i>N</i>-Acyliminium Ion Generation: Synthesis of Enantiopure 1-Azabicycles and Preparation of an Intermediate for a Projected Synthesis of Roseophilin