(3aR,4R,12aS,12bR)-4-hydroxy-2,2-dimethyl-4,5,12a,12b-tetrahydro-3aH,7H-[1,3]dioxolo[3,4]pyrido[2,1-b][1,3]benzothiazin-7-one                                                                                                                                                              在
                                                                                                                                                                                 
盐酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        以82.1%的产率得到(5aS,6R,7R,8R)-6,7,8-trihydroxy-6,7,8,9-tetrahydro-5aH,11H-pyrido[2,1-b][1,3]benzothiazin-11-one