Li YM, Li X, Peng FZ, Li ZQ, Wu ST, Sun ZW, Zhang HB, Shao ZH. Catalytic asymmetric construction of spirocyclopentaneoxindoles by a combined Ru-catalyzed cross-metathesis/double Michael addition sequence. Org Lett. 2011 Dec 02;13(23):6200–3. doi: 10.1021/ol202624f. PMID: 22044048.