Stereospecificity in allergic contact dermatitis to simple substituted methylene lactones derivatives
摘要:
The enantiomers of beta,gamma-dimethyl- and beta-methyl-alpha-methylene-gamma-butyrolactones have been synthesized stereospecifically from glutamic acid and beta-hydroxy isobutyric acid, respectively. Guinea pigs have been sensitized (Freund complete adjuvant technique) and tested to them. Both enantiomers of beta-methyl lactone as well as (+)-beta,gamma-dimethyl lactone induced enantiospecific allergic contact dermatitis (ACD); in turn, (-)-beta,gamma-dimethyl lactone showed no specificity. An interpretation is proposed.
A NEW SYNTHETIC ROUTE TO α-METHYLENE AND β-METHYLENE-γ-BUTYROLACTONES VIA HOMOLYTIC CARBOCYCLIZATION
作者:Osamu Moriya、Makoto Okawara、Yoshio Ueno
DOI:10.1246/cl.1984.1437
日期:1984.8.5
α-Methylene-γ-butyrolactones were prepared using butoxyallene via stereoselective homolytic carbocyclization of vinyl radicals, similarly, β-methylene analogues were also prepared.
Stable organozinc compounds derived from alkyl 3-alkyl 2-(bromomethyl) propenoates reacted with ketones and aldehydes to give alpha-methylene gamma-butyrolactones in excellent yields. Different reaction parameters were studied and some transition states were proposed.