(3a
R)-3-(6-amino-5-nitro-pyrimidin-4-yl)-6
c-(Ξ)-tetrahydropyran-2-yloxy-5
t-(Ξ)-tetrahydropyran-2-yloxymethyl-(3a
r,6a
c)-tetrahydro-furo[2,3-
d]oxazole-2-thione                                                                                                                                                              在
                                                                                                                                                                                 aluminium amalgam                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环   、                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(3aR)-3-(5,6-diamino-pyrimidin-4-yl)-6c-(Ξ)-tetrahydropyran-2-yloxy-5t-(Ξ)-tetrahydropyran-2-yloxymethyl-(3ar,6ac)-tetrahydro-furo[2,3-d]oxazole-2-thione