Synthesis of optically pure di- to tetra-substituted cyclopentanes from sugar-derived norbornene derivatives
作者:Derek Horton、Takayuki Usui
DOI:10.1016/0008-6215(92)84149-m
日期:1992.9
The chiral norbornene derivative 2 obtained from Lewis acid-catalyzed reaction of an L-arabinose-derived dienophile 1 and cyclopentadiene was oxidized with OsO4-NaIO4 to the dialdehyde 3, a tetrasubstituted cyclopentane. Mild treatment of 3 with [Rh(dppp)2]Cl [dppp = Ph2P(CH2)3PPh2] (4) selectively epimerized the aldehyde adjacent to the methoxycarbonyl group to give the epi-aldehyde 8. Under more