Synthesis and structure–activity relationships of a new class of selective EP 3 receptor agonist, 13,14-didehydro-16-phenoxy analogues of prostaglandin E 1
A series of 13,14-didehydro-16-phenoxy analogues of prostaglandin E1 was synthesized and their agonistic activity on EP receptor subtypes was evaluated. 13,14-Didehydro-16-phenoxy-1-decarboxy analogues, 7e and 7f, display highly selective activity on the EP3 receptor subtype, thus, their utility as a selective anti-ulcer agent can be expected.
A hydroxyfattysulfonic acid analog represented by Formula (I): wherein X is an ethylene group, a vinylene group or an ethynylene group; Y is an ethylene group, a vinylene group, an ethynylene group, OCH
2
or S(O)pCH
2
wherein p is 0, 1 or 2; m is an integer of 1 to 5 inclusive; n is an integer of 0 to 4 inclusive; R
1
is a C
1-8
alkyl group, a C
3-8
cycloalkyl group, a C
1-4
alkyl group substituted with a C
3-8
cycloalkyl group, a C
1-4
alkyl group substituted with an aryl group or a C
1-4
alkyl group substituted with an aryloxy group; R
2
is a hydrogen atom or a methyl group; R
1
and R
2
together with the carbon atom to which they are attached may form a C
3-8
cycloalkyl group; R
3
is a hydrogen atom or a C
2-8
acyl group; R
4
is OR
5
or NHR
6
, wherein R
5
is a hydrogen atom, a C
1-4
alkyl group, an alkali metal, an alkaline earth metal or an ammonium group and R
6
is a hydrogen atom or a C
1-4
alkyl group; or a pharmaceutically acceptable salt or a hydrate thereof. The compounds of the present invention are useful as an elastase release inhibitor.
Triply convergent synthesis of 15-(phenoxymethyl) and 4,5-allenyl prostaglandins. Preparation of an individual isomer of enprostil
作者:Owen W. Gooding、Colin C. Beard、Gary F. Cooper、David Y. Jackson
DOI:10.1021/jo00066a020
日期:1993.7
A triply convergent synthesis of the PGE2 derivatives 1, 3, 4, and 5, containing either the 15-(phenoxymethyl) or the 15-amyl omega side chain and the 5,6-didehydro or the 4,5-allenyl alpha side chain, is described. This two-pot method employs organocopper reagents of the type Li2RomegaCuCNMe to selectively introduce the omega side chain to enantiopure enone 6 followed by in situ trapping of the so-formed enolates as silyl enol ethers 22a and 22b. The kev step is the alkylation of regiochemically defined lithium enolates, generated from the corresponding silyl enol ethers 22a and 22b, with the unsaturated alpha side chain triflates 8b and 9c. The method was found to be general for propargylic and allenic alpha side chains but unsuccessful for the cis allylic and saturated a side chains found in PGE2 and PGE1, respectively.