A new route to 4-unsubstituted .BETA.-lactams through ureidomethylation of ketene silyl acetals.
作者:KIYOSHI IKEDA、YOSHIYASU TERAO、MINORU SEKIYA
DOI:10.1248/cpb.29.1747
日期:——
α-Ureidomethylated carboxylates were obtained by the reaction of ketene silyl acetals with benzyl N-(chloromethyl) carbamates in the presence of titanium tetrachloride. Successive hydrogenolysis over palladium-on-charcoal followed by treatment with lithium diisopropylamide gave β-lactams.