New intermediate, an optically active (1R,5S,6S,7R)-6-tert-butyldiphenylsilyloxmethyl-7-hydroxy-bicyclo[3.3.0]oc tan-3-one (I) having high optical purity which is useful for the synthesis of an optically active carbacyclin and an optically active pentalenolactone E methyl ester. The compound (I) is also an intermediate compound serving for the purpose of improving the optical purity of (1R,5S,6S,7R)-3,3-ethylenedioxy-6-hydroxymethyl-7-(2'-tetrahydropyranyloxy )bicyclo[3.3.0]octane. The compound (I) is prepared by reacting (1R,5S,6S,7R)-3,3-ethylenedioxy-6-hydroxymethyl-7-(2'-tetrahydropyranyloxy )bicyclo[3.3.0]octane with tert-butylchlorodiphenylsilane in the presence of a base and removing the ethylenedioxy and tetrahydropyranyl groups of the resultant compound under an acid condition.
新中间体化合物(I)是一种光学活性化合物,具有高光学纯度,可用于合成光学活性的碳环烯酸和光学活性的五环内酯E甲酯。化合物(I)还是一种中间体化合物,可用于提高(1R,5S,6S,7R)-3,3-乙二氧基-6-羟甲基-7-(2'-
四氢呋喃基氧基)bicyclo[3.3.0]
辛烷的光学纯度。化合物(I)通过在碱存在下反应(1R,5S,6S,7R)-3,3-乙二氧基-6-羟甲基-7-(2'-
四氢呋喃基氧基)bicyclo[3.3.0]
辛烷与叔丁基
氯二苯基
硅烷,然后在酸性条件下去除产物的乙二氧基和
四氢呋喃基团而制备得到。