title: Synthesis and gastric antisecretory properties of 15-deoxy-16-hydroxyprostaglandin E analogues.
abstract: The preparation and gastric antisecretory activity of a series of 15-deoxy-16-hydroxyprostaglandin analogues are described. The compounds were tested intravenously in histamine-stimulated Heidenhain pouch dogs in relation to the reference standards PGE1 and PGE1 methyl ester (PGE1ME). The parent compound of this seris, (+/-)-15-deoxy-16alpha,beta-hydroxyprostaglandin E1 methyl ester (3), was found to be equipotent to the reference standard PGE1ME. Methylation at C-16 of 3 produced 8 which was found to be some 40 times more potent than PGE1. In sharp contrast, addition of two methyl groups to 3 at C15 or C17 markedly reduced the antisecretory action. The 16-ethyl analogue of 3 also showed reduced potency. Removal or epimerization of the C-11 hydroxy group of 8 reduced the activity. Likewise, hydrogenation or changing the stereochemistry of the 13,14 double bond from trans to cis decreased the activity. On the other hand, omega-homologation of 8 or the introduction of a cis-5,6 double bond did not affect the potency. From these studies, it appears that 8, 16, and 17 possess optimum gastric antisecretory effects in this series.
mesh_terms: D000818:Animals; D004285:Dogs; D005260:Female; D005750:Gastric Juice / Q000378:metabolism; D005753:Gastric Mucosa / Q000187:drug effects; D011459:Prostaglandins E, Synthetic / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D011459:Prostaglandins E, Synthetic