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Synthesis and Photochemistry of 3‐(2‐Thienyl)‐2,2‐dimethyl‐2H‐azirine The synthesis of 3‐(2‐thienyl)‐2,2‐dimethyl‐2 H‐azirine (1) is described. UV. irradiation of 1 in benzene solution generates the nitrile isopropylide 2 which reacts in a regiospecific manner with activated C, C and C, O double bonds to give 1‐pyrrolines and 3‐oxazolines, respectively. With chelidonic acid diethyl ester the cycloaddition of 2 to the C, C double bond is preferred.
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Pfoertner et al. (1980) studied this question.
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