Bei der Reaktion der symmetrischen Harnstoffe (I) mit Glyoxal (II) entstehen in Abhängigkeit von den Substituenten vorzugsweise die symmetrischen Bicyclen (III).
Be Formed under Thermal Conditions. -A new and facile one-pot formation of spiro[indole-pyrido-thiazines] like (IV) as well as pyridothiazines such as (VI) and (VIII) is reported. -(DANDIA*, A.; ARYA, K.; SATI, M.; GAUTAM, S.; Tetrahedron 60 (2004) 24, 5253-5258; Dep. Chem., Univ. Rajasthan, Jaipur 302 004, India; Eng.) -Jannicke 40-162
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