Synthetic approach to (+)-aldosterone and its relatives. 1. Synthesis of (+)-trans-4,5-(4-methoxybenzo)-1.beta.,7a.beta.-[2.alpha.-(methoxymethyl)-5-oxofuro]hydrindan
Diels-alder cycloadditions of chiral butenolides with cyclopentadiene: endo/exo selectivity
作者:Rosa Batllori、Josep Font、Montserrat Monsalvatje、Rosa M. Ortuño、Francisco Sanchez-Ferrando
DOI:10.1016/s0040-4020(01)80048-x
日期:1989.1
Chiral butenolides are revealed to be good dienophiles in Diels-Alderreactions with cyclopentadiene, affording endo and exo adducts, whose fully characterization is provided. Selectivity of these cycloaddition reactions has been shown to be temperature dependent not as a result of a thermodynamic equilibrium between the isomers, but due to a kinetically controlled process.
A synthetic approach to (+)-aldosterone and its relatives (2)- a stereoselective synthesis of (+)--4,5-(4-methoxybenzo)- 1β , 7aβ - ( 2α-methoxymethyl- 5 -oxofuro) hydrindane
A stereoselectivity in an intramolecular cycloaddition of the olefinic -quinodimethanes 13 and 23 generated from the thermolysis of optically active 4β-[2-(4-methoxybenzocyclobutenyl)ethyl] -5α-methoxymethyl-3-phenyl-thio-methylenefuran-2-ones 12 and 22, respectively, is studied and a stereoselective synthesis of (+)--4,5-( 4-methoxybenzo) -1β,7aβ-(2α-methoxymethyl-5-oxofuro)hydrindane 1 is also described