7-acetyl-2,3,3a,9a-tetrahydro-3-hydroxy-2-hydroxymethyl-8H-furo[2',3':4,5]oxazolo[3,2-a]pyrimidin-8-one 在
ammonium hydroxide 作用下,
以
甲醇 为溶剂,
反应 2.0h,
以65%的产率得到(5Z)-5-(1-aminoethylidene)-3-[3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]pyrimidine-2,4(3H,5H)-dione