(R)-((2S,3S,4R)-2-Ethyl-5-oxo-4-phenylsulfanylmethyl-tetrahydro-furan-3-yl)-hydroxy-acetic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 camphor-10-sulfonic acid                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 36.0h,
                                                                                                                以89%的产率得到(3α,3aα,4β,6aα)-(+/-)-4-Ethyldihydro-3-<(phenylthio)methyl>furo<3,4-b>furan-2,6(3H,4H)-dione