A new synthetic route to the antibiotics (+)-PS-5 and (+)-PS-6 is described. The preparation involves a fully stereocontrolled reaction between the enantiomerically pure N-trimethylsilylimine of lactic or mandelic aldehyde and the lithium enolate of the tert-butyl butanoate or tert-butyl isovalerate, respectively. Conversion of the azetidinones obtained to 4-acetoxy derivatives via oxidative cleavage of the hydroxyethyl or hydroxybenzyl side chain and introduction of the necessary appendage in the position 4 of the azetidinone ring, followed by assemblage of the bicyclic ring system, afforded the natural trans-carbapenems (+)-PS-5 and (+)-PS-6.
PALOMO, CLAUDIO;COSSIO, FERNANDO P.;ARRIETA, ANA;ODRIOZOLA, JOSE M.;OIARB+, J. ORG. CHEM., 54,(1989) N4, C. 5736-5745
作者:PALOMO, CLAUDIO、COSSIO, FERNANDO P.、ARRIETA, ANA、ODRIOZOLA, JOSE M.、OIARB+
DOI:——
日期:——
CHIBA, TOSHIYUKI;NAKAI, TAKESHI, CHEM. LETT.,(1987) N 11, 2187-2188
作者:CHIBA, TOSHIYUKI、NAKAI, TAKESHI
DOI:——
日期:——
CAINELLI, GIANFRANCO;PANUNZIO, MAURO;GIACOMINI, DARIA;MARTELLI, GIORGIO;S+, J. AMER. CHEM. SOC., 110,(1988) N 20, C. 6879-6880