Synthesis of the key component for preparation of 6-ketoprostaglandins by a two-component coupling process: synthesis of 6-keto-prostaglandin E1, ornoprostil and Δ2-trans-6-ketoprostaglandin E1
摘要:
Starting with commercially available (3S,4R)-3-(methoxymethyloxy)-2-methylidene-4- siloxycyclopentanone-2, useful 6-keto-prostaglandin intermediates 1 have been prepared in good yields by a sequence of reactions which includes treatment with NaBr in the presence of BF3 . OEt(2), Pd-catalysed coupling of the resulting 2-bromomethyl-4-siloxycyclopent-2-enone 3 with the alkenylborane 4 or 9 and conversion of the alkenyl moiety into an epoxy and then into a keto group. The synthesis of 6-keto-PGE(1), ornoprostil and Delta(2)-trans-6-keto-PGE(1) by using 1 is also described.
Prostaglandin synthesis via two-component coupling. Highly efficient synthesis of chiral prostaglandin intermediates 4-alkoxy-2-alkyl-2-cyclopenten-1-one and 4-alkoxy-3-alkenyl-2-methylenecyclopentan-1-one
Synthesis of a key intermediate for preparation of 4,5-didehydro prostaglandins containing an allenyl side-chain group via two-component coupling process. Synthesis of enprostil
作者:Naoya Ono、Yasufumi Kawanaka、Yukio Yoshida、Fumie Sato
DOI:10.1039/c39940001251
日期:——
Enone 8, a key intermediate in the preparation of 4,5-didehydro prostaglandinsvia a two component coupling process, is prepared efficiently from readily available enone 6; the synthesis of enprostil, an antiulcer agent developed by Syntex, using enone 8 is also described.