55022-57-6Relevant articles and documents
Synthesis of (5E)- and (5Z)-11-Deoxy-6,11α-epoxy-Δ5-prostaglandin F1α Sodium Salts: 6,11α-Enol Ether Isomers of Prostacyclin
Sih, John C.,Graber, David R.
, p. 4919 - 4927 (1982)
The key intermediates, (5S,6R)- and (5R,6R)-11-deoxy-6,11α-epoxy-5-hydroxy cyclic ethers, 22a,b, were prepared from the reaction of a C-9 silyl PGF2α derivative 12 with mercuric acetate (oxymercuration), followed by conversion of the mercurioacetate substituent to a hydroxy group.Attempts to construct the 6,11α oxygen bridge by reaction of 12 and other C-9 protected PGF2α derivatives with iodine, N-bromosuccinimide, and phenylselenenyl chloride were unsuccessful.Reaction of 11 and 12 with iodine resulted in removal of the C-9 blocking group and the isolation of 6,9-iodo cyclic ether products.Treatment of 13 with phenylselenenyl chloride gave the β-chlorophenylselenenyl addition adduct 18.Conversion of alcohols 22a,b to their mesylate derivatives, 25a,b, and subsequent reaction with potassium methoxide in dimethyl sulfoxide afforded the labile Δ5 enol ethers, 29a,b.The success of this elimination reaction was critically dependent on the base, the reaction solvent, and the workup conditions.The structural assignments of 29a,b were based on their spectral properties and hydrolysis to 6-keto-PGF1α methyl ester.The stereoconfiguration at C-6 was assigned by conversion of the oxymercuration product obtained from 12 to the 5,6-dihydro-6,11α-cyclic ether 20.The C-5 stereoconfiguration of alcohols 22a,b was established by the mode of formation of enol ethers 29a,b.In contrast to PGI2 methyl ester, 29a,b in aqueous acid showed a greater tendency to form the internal ketal 34 during hydrolysis to 6-keto-PGF1α methyl ester.
Total Synthesis of Prostaglandin F2α via Nickel-Promoted Stereoselective Cyclization of 1,3-Diene and Aldehyde
Sato, Yoshihiro,Takimoto, Masanori,Mori, Miwako
, p. 734 - 736 (2007/10/03)
The total synthesis of prostaglandin F2α (PGF2α) was accomplished via nickel-promoted cyclization of 1,3-diene and aldehyde in a chain in the presence of 1,3-cyclohexadiene (1,3-CHD). The cyclization of 16 prepared in an optically active form from chiral epoxy alcohol 10 stereoselectively gave the key intermediate 18, which has both an α-chain and the four contiguous chiral carbon centers in PGF2α, in a one-pot reaction. Intermediate 18 was successfully transformed into PGF2α.