Fused cyclopentane—4-substituted 3,5-dioxalane lactone compounds useful as an intermediate in the synthesis of prostaglandin analogs are provided. The compounds have the formula A:
wherein R represents an aryl group such as p-methoxyphenyl.
This compound can be reacted with a lower alkyl aluminum compound to open the dioxalane ring and reduce the lactone to lactol, without over-reducing to diol. The resulting compound can be functionalized to insert chemical side groups of target prostaglandins, adding the required α-side chain and then the required ω-side chain sequentially and independently of each other. The compounds and process are particularly suitable for preparing lubiprostone.
提供了作为合成
前列腺素类似物中间体有用的融合
环戊烷-4-取代3,5-二氧杂环
戊内酯化合物。这些化合物具有以下公式A:
其中R代表芳基,如对
甲氧基苯基。
这种化合物可以与较低的烷基铝化合物反应,打开二氧杂环
戊内酯环并将内酯还原为内醇,而不会过度还原为二醇。所得化合物可以被官能化,以插入目标
前列腺素的
化学侧链,依次独立地添加所需的α-侧链和所需的ω-侧链。这些化合物和过程特别适用于制备利布普罗斯通。