(3aR,4R,6S,6aR)-4-(2-Amino-acetylamino)-2,2,6-trimethyl-tetrahydro-furo[3,4-d][1,3]dioxole-4-carboxylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
potassium tert-butylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以70%的产率得到(2S,3R,4R,5R)-3,4-O-isopropylidene-2-methyl-6,9-diaza-1-oxaspiro[4.5]decane-7,10-dione