Studies toward the total synthesis of (+)-ptilomycalin A. Use of a tethered Biginelli condensation for the preparation of an advanced tricyclic intermediate
作者:Larry E. Overman、Michael H. Rabinowitz
DOI:10.1021/jo00064a007
日期:1993.6
An intramolecular ureidoaldehyde condensation, 16 + (R)-14 --> 19, is the key step in a seven-step preparation of the enantiopure spirotricycle 23, a potential intermediate for the enantioselective total synthesis of ptilomycalin A.