二碳酸二叔丁酯   、                                                                                      
(2R,3S)-3-Amino-2-hydroxy-3-phenyl-propionic acid (4R,4aR,7aS,8S)-8-hydroxy-6,6,8-trimethyl-4,4a,5,6,7,7a,8,9-octahydro-2-oxa-cyclopenta[f]azulen-4-yl ester                                                                                                                                                                                              以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 [(5S,5aS,8aR,9R)-5-hydroxy-5,7,7-trimethyl-4,5a,6,8,8a,9-hexahydroazuleno[5,6-c]furan-9-yl] (2R,3S)-2-hydroxy-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate