2-((S)-2,2-Dimethyl-[1,3]dioxolan-4-ylmethyl)-2-(3-oxo-butyl)-cycloheptane-1,3-dione                                                                                                                                                              在
                                                                                                                                                                                 
L-组氨酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 14.5h,
                                                                                                                生成                                                 
(S)-4a-((S)-2,2-Dimethyl-[1,3]dioxolan-4-ylmethyl)-4,4a,6,7,8,9-hexahydro-3H-benzocycloheptene-2,5-dione   、                                                                                             (R)-4a-((S)-2,2-Dimethyl-[1,3]dioxolan-4-ylmethyl)-4,4a,6,7,8,9-hexahydro-3H-benzocycloheptene-2,5-dione