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With Tris(3,6-dioxaheptyl)amine; potassium carbonate; In dichloromethane; water; for 17h;Heating / reflux;
The compound from step A (6.2 g, 33.5 mmole), (1,3-dioxolan-2-yl-methyl)triphenylphosphonium bromide (22.6 g, 52.7 mmole), tris[2-(2-methoxyethoxy)ethyl]amine (11.2 ml, 34.9 mmole), sat. aq. K2CO3 (150 mls), and CH2Cl2 (150 ml) were heated at reflux for 17 hours. The mixture was cooled and the aqueous layer was washed with CH2Cl2 (2×). The combined organic layers were washed with NaHCO3, brine, dried (MgSO4), and concentrated.