Novel lactones of the formula ##STR1## wherein the dotted line indicates the optional presence of a second bond, A is a single bond or --CH.sub.2 --CH.sub.2 --, R is selected from the group consisting of hydrogen, alkyl of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms, R.sub.6 is --OR.sub.A ', R.sub.A ' is selected from the group consisting of hydrogen, tetrahydropyranyl, alkyl of 1 to 3 carbon atoms and ##STR2## R.sub.A " is selected from the group consisting of alkyl of 1 to 3 carbon atoms optionally substituted with carboxyl and phenyl optionally substituted with a member of the group consisting of carboxyl, free hydroxyl, hydroxyl protected with an acyl of 2 to 4 carbon atoms and hydroxyl protected with an easily hydrolyzable group and R and R.sub.6 together form a keto group, R.sub.7 is --CH.sub.2).sub.m.sbsb.A --CH.sub.3, m.sub.A is 3,4,5 or 6 and R.sub.6 and R.sub.7 taken together form .dbd.CH--(CH.sub.2).sub.n.sbsb.A --CH.sub.3, n.sub.A is 2,3,4 or 5 and the wavy lines indicate that the bonds are in one or the other of the possible configurations and when A is a simple bond, the bond between the cyclopentane ring and the oxygen is in the .alpha.-position having hypotensive activity and the wavy lines represent a paired configuration selected from the group consisting of .alpha.,.beta. and .beta.,.alpha. and mixtures thereof and novel processes and intermediates for their preparation.
分子式为##STR1##的新型内酯,其中虚线表示第二键的可选存在,A为单键或--CH.sub.2 --CH.sub.2 --,R选自氢、1至4个碳原子的烷基和2至4个碳原子的烯基和炔基,R.sub.6为--OR.sub.A ',R.sub.A '选自氢、
四氢吡喃基、1至3个碳原子的烷基和##STR2##,R.sub.A "选自1至3个碳原子的烷基,可选地被羧基取代和苯基,可选地被羧基、游离羟基、用2至4个碳原子的酰基保护的羟基和用易
水解基团保护的羟基取代的成员组成,R和R.sub.6共同形成酮基,R.sub.7为--CH.sub.2).sub.m.sbsb.A --CH.sub.3,m.sub.A为3、4、5或6,R.sub.6和R.sub.7共同形成.dbd.CH--(CH.sub.2).sub.n.sbsb.A --CH.sub.3,n.sub.A为2、3、4或5,波浪线表示键在可能的构型之一或另一构型中,当A为简单键时,
环戊烷环与氧之间的键在α-位置具有降压活性,波浪线表示从α、β和β、α和其混合物中选择的成对构型,并提供其制备的新型过程和中间体。