A very short synthesis of choral prostaglandln El methyl ester 1s described.. Although a number of efflclent synthetic routes to prostaglandlns (PGs) have been explored, 495 the three-component couphng process , VIZ., consecutive lntroductlon of the two side-chans to 4hydroxy-Z-cyclopentenone, 1s ev
Three-component coupling synthesis of prostaglandins. A simplified, general procedure
β Scribed by Masaaki Suzuki; Yasushi Morita; Hiroshi Koyano; Masahiro Koga; Ryoji Noyori
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- French
- Weight
- 892 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
β¦ Synopsis
In the presence of dtmethylzinc. (R)-tert-butyldimethylstloxy-2cyclopentenone can be linked with (S.E)-1-lithio-3-tert-butyldimethylsiloxy-1 -octene and methyl 7-iodo-5-heptynoate.
giving a protected 5,6didehydroprostaglandin E2. Use of an o side-chain aldehyde or nitroalkene in place of the propargylic iodide affords the C-7 and C-6 functionalized prostaglandins, respectively.
This new protocol constitutes the simplest three-component method for the synthesis of various natural and unnatural prostaglandins.
π SIMILAR VOLUMES
1384 OC, 21 h) was followed by reduction with excess tributyltin hydride-di-tert-butyl peroxide (50 "C, 7.5 h)" to give the deoxygenated, acetylenic ketone \_ (85%. [ CLI i6 -46.1" (2 0.375. CH30H)). Subsequent stereoselective reduction with diisobutylaluminum hydride modified by 2, 6-di-tert-butyl-
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Synthesis of Vinyl Epoxides via a Three-Component Coupling. -A one-pot procedure for the preparation of title compounds such as (IV), which are interesting synthetic intermediates, is presented. The synthesis of the key reagent (II) is described. -(ROWBOTTOM, MARTIN W.; MATHEWS,