Chronic Actinic Dermatitis to Sesquiterpene Lactones: [2+2] Photoreaction Toward Thymidine of (+) and (−) α-Methylene-Hexahydrobenzofuranone with a cis Ring Junction
摘要:
Abstract(+) and (−) α‐methylene‐hexahydrobenzofuranone derivatives with a stereochemically pure cis ring junction were used as models of sesquiterpene lactones to study their photoreactivity toward thymidine. After 313 nm irradiation of a deoxygenated acetone solution of lactone models and thymidine, six [2+2] photoadducts were isolated for each enantiomer and fully characterized by a combination of NMR experiments. A common syn regioselectivity and exo stereoselectivity were observed for photoadducts. This high photoreactivity of α‐methylene‐γ‐butyrolactone ring toward thymidine could be an explanation of the progressive evolution of allergic contact dermatitis toward chronic actinic dermatitis.
Sesquiterpene lactones are natural stereochemically pure compounds, which show a number of biological activities. In order to study the reactivity of sesquiterpene lactones in biological systems, we describe herein the asymmetric synthesis of a simple model, the α-methylene-hexahydrobenzofuranone 1, which includes the α-methylene-γ-butyrolactone moiety and presents all the different possible ring junctions