Geminal prostaglandins (P.G.'s) are synthesized which are represented by the general formula: ##STR1## where A is a 4 or 5 carbon atom ring-completing group (CH.sub.2).sub.1+m --X--(CH.sub.2).sub.z where m = 0, 1 or 2, Z = 0 or 1, 0<(m+z)<3, and X is --CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CHOH--, ##STR2## and, when m = 0 and z = 1, is also --CH=CH-- or ##STR3## Y is divalent straight chain alkylene of 4 to 8 carbon atoms or --CH.sub.2 CH=CH(CH.sub.2).sub.3 --; R is alkyl of 4 to 7 carbon atoms; Q is --CO.sub.2 H or --CH.sub.2 OH provided that it is not --CH.sub.2 OH when ##STR4## or Y-Q taken together may be heptyl or allyl.
Geminal型
前列腺素(P.G.)是由一般式所代表的合成物:##STR1## 其中A是一个4或5个碳原子的环补充基团(CH.sub.2).sub.1+m --X--(CH.sub.2).sub.z,其中m=0, 1或2,Z=0或1,0<(m+z)<3,并且X是--CH.sub.2 --CH.sub.2 --,--CH.sub.2 --CHOH--,##STR2## 当m=0且z=1时,也是--CH=CH--或##STR3## Y是4到8个碳原子的双价直链烷基或--CH.sub.2 CH=CH(CH.sub.2).sub.3 --;R是4到7个碳原子的烷基;Q是--CO.sub.2 H或--CH.sub.2 OH,前提是当##STR4##时不是--CH.sub.2 OH,或者Y-Q在一起可以是庚基或
丙烯基。