2,1-Bensoidoxazoles [anthranils]. Synthesis and opening of the isoxazole ring (review)
The present review covers the literature on the synthesis of 2,l-benzoisoxazoles (anthranils) (I), and reactions of this bicyclic system which involve opening of the isoxazole ring. Since a detailed and satisfactorily full review of the chemistry of 2, l-benzoisoxazoles was published in 1967 [96], the main thrust of the present review is to cover the literature of the last twenty years. It has nevertheless been necessary to include earlier publications, especially when these deal with general methods of synthesis of anthranils. t i. Synthesis of 2~l-Benzisoxazoles
Intramolecular nitrene insertion into nitrogen containing rings. Pyrolyses of 3-(1-methyl-2-imidazolyl)- and 3-(1-methyl-5-pyrazolyl)-2,1-benzisoxazole (anthranils)
Die Cyclisierung von 3-(2-Pyridyl)-2,1-benzisoxazol (I) zu (III) uber die Nitren-Zwischenstufe (II) wird auf ahnliche Verbindungen ubertragen.
Photochemical Behaviour of Cyclopropa[c]Chromenes in Alcohols
Cyclopropa[c] chromenes (VI, VII, VIII, IX) on irradiation with a mercury high-pressure or low-pressure lamp in alcoholic solutions (MeOH, EtOH, i-PrOH) are transformed into the corresponding 2-(1′-alkoxy-but-3′-enyl)-phenols (cf. X, XI, trans. and cis-XII). Possible mechanisms of this photoreaction are discussed.