Adam, W., Peters, K., Peters, E.-M., & Schambony, S. B. (2001). Efficient control of the diastereoselectivity and regioselectivity in the singlet-oxygen ene reaction of chiral oxazolidine-substituted alkenes by a remote urea NH functionality: comparison with dimethyldioxyrane and m-chloroperbenzoic acid epoxydations. Journal of the American Chemical Society, 123, 7228-7232.