... 24; Kalivretenos, A.; Nakanishi, K., unpublished results. 25; R. Goodnow, K. Konno, M. Niwa, TA Kallimopoulos, R. Bukownik, D. Lenares, K. Nakanishi; The preparation of this intermediate has been reported: Tetrahedron, 46 (1990), pp. 3267–3286. ...