(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