Dispiroketals in synthesis (part 6): Highly stereoselective alkylation of dispiroketal protected lactate and glycolate enolates
作者:Robert Downham、Kun Soo Kim、Steven V. Ley、Martin Woods
DOI:10.1016/s0040-4039(00)75813-8
日期:1994.1
Protected lactic acid enolates have been alkylated with a range of electrophiles to give the substituted adducts with moderate to excellent stereoselectivity. A chiral protected glycolic acid adduct has also been doubly alkylated with high stereoselectivity.
Dispiroketals in synthesis (part 10): Further reactions of dispoke protected lactate and glycolate enolates
作者:Geert-Jan Boons、Robert Downham、Kun Soo Kim、Steven V. Ley、Martin Woods
DOI:10.1016/s0040-4020(01)85241-8
日期:1994.1
alpha-Hydroxy acids have been reacted with bis-dihydropyrans to give dispiroketal adducts (1,8,13,16-tetraoxadispiro[5.0.5.4]-hexadecan-14-ones). The enolates derived from these compound undergo reaction with electrophiles with generally high levels of diastereoselectivity. Subsequent deprotection of these compounds gives alpha-hydroxy esters of high enantiomeric excess.
Boons G.-J., Downham R., Kun Soo Kim, Ley S. V., Woods M., Tetrahedron, 50 (1994) N 24, S 7157-7176
作者:Boons G.-J., Downham R., Kun Soo Kim, Ley S. V., Woods M.