A solution of compound 8d (3.55 g; 7.42 mmol) and heptyl acrylate (9) (2.55 g; 15 mmol) in EtOH (abs., 50 mL) was stirred at RT for seven days. The volatile components were removed under reduced pressure and the product purified on a dry column (eluting from heptane with EtOAc) to give 4.5 g (43%) of 1d as a colorless oil. 1