Two new phenylpropanoid glycosides with interesterification from Scrophularia dentata Royle ex Benth

Two new phenylpropanoid glycosides (1–2), along with seven known ones (3–9), were isolated from the whole plant of Scrophularia dentata Royle ex Benth. Their structures were elucidated by spectroscopic methods. Among them, compounds 1 and 2 failed to separated, because they can easily transform into each other by acyl migrant reaction. In this paper, the interesterification mechanism was discussed firstly and the rule can be used in the similar structure elucidation in future.