The Hagemann's ester (Fig. 1) has been extensively used for the synthesis of various complex compounds. 1, 2 The reason might be due to its highly-functionalized nature and ready availability. 1, 2 The reaction of Hagemann's ester and an electrophile can occur theoretically at C-1, C-3, C-5, and C-2'positions (Fig. 1). As an example, however, it has been generally accepted that the site preference for alkylation was C-3, the resulting C-3- ...
