The reaction of cyclic diazoamides with aryl aldehydes catalyzed by rhodium(II) acetate leads to intermolecular stereoselective epoxide ring formation. A series of spiro-indolooxiranes has been synthesized following the described method in a facile manner. The use of aryl dialdehydes in the course of reaction of cyclic diazoamide resulted the formation of bis-spiro-indolooxiranes
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Muthusamy et al. (2004) studied this question.