重氮甲烷   、                                                                                      
(S)-2-((1R,2S,4R,6S,7R)-1,10,10-Trimethyl-3-oxa-tricyclo[5.2.1.02,6]dec-4-ylsulfanyl)-butyric acid                                                                                                                                                                                              以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                                                        以46%的产率得到<2R-(2α(R*),3aα,4α,7α,7aα)>-2-<(2,3,3a,4,5,6,7,7a-Octahydro-7,8,8-trimethyl-4,7-methanobenzofuran-2-yl)thio>butansaeure-methylester