Most of the primary prostaglandins and several biologically important prostaglandin analogues were converted to 1, 9-, 1, ll-or 1, 15-lactones, in order to investigate the biological profiles of these internal esters and to assess their potential as prodrugs for the corresponding open-chain hydroxy acids. In each case, the key lactonization step was done using Corey's “double activation” procedure (cyclization of w-hydroxy-2-pyridinethiol ...
![(1S,5R,5aR,6E,8S,14Z,16aR)-3-butyl-8-pentyl-1,5a,8,11,12,13,16,16a-octahydro-5H,10H-1,5-methano[1,3,2]dioxaborepino[5,6-e][1]oxacyclotridecin-10-one结构式](https://image.chemsrc.com/caspic/282/62410-92-8.png)
![(1R,10R,11S,13R,Z)-11-((triphenylsilyl)oxy)-13-((S,E)-3-((triphenylsilyl)oxy)oct-1-en-1-yl)-2-oxabicyclo[8.2.1]tridec-7-en-3-one结构式](https://image.chemsrc.com/caspic/289/62410-87-1.png)
![(1S,5R,5aR,6E,8S,14Z,16aR)-3-butyl-8-pentyl-1,5a,8,11,12,13,16,16a-octahydro-5H,10H-1,5-methano[1,3,2]dioxaborepino[5,6-e][1]oxacyclotridecin-10-one结构式](https://image.chemsrc.com/caspic/158/62410-95-1.png)
![(1E,3S,9Z,11aR,12S,14R,14aR)-12-hydroxy-3-pentyl-14-((trimethylsilyl)oxy)-3,6,7,8,11,11a,12,13,14,14a-decahydro-5H-cyclopenta[e][1]oxacyclotridecin-5-one结构式](https://image.chemsrc.com/caspic/196/62410-94-0.png)