Synthesis of cyclooxygenase metabolites of 8,9-epoxyeicosatrienoic acid (EET): 11- and 15-hydroxy 8,9-EETs
作者:Bogdan Barnych、Amy A. Rand、Tomas Cajka、Kin Sing Stephen Lee、Bruce D. Hammock
DOI:10.1039/c7ob00789b
日期:——
COX metabolites of 8,9-EET, previously observed as potent mitogenic lipid mediators, were synthesized for the first time by using two synthetic approaches. These synthetic materials allow for structural confirmation of COX metabolites of 8,9-EET and further study of their biological roles.
Estramicins: a novel cyclic diyl precursor derived from estradiol
作者:Christel Meert、Jing Wang、Pierre J. De Clercq
DOI:10.1016/s0040-4039(97)00276-1
日期:1997.3
The estradiolderived ynone 2 is obtained via a 13 step sequence starting from estrone. One of the key-steps involves the addition to estrone derivative 3 of the lithio derivative 8. Obtention of the latter in enantiomerically pure form involves the lipase mediated kinetic resolution of racemic alcohol (±) 5. The triethylamine induced elimination of dimesylate 15 leads to the Bergman precursor 16,
A series of metalla-dehydro[11]annulenes with Craig-Hückel hybrid aromaticity, were constructed by a one pot [10+1] strategy. They are the first monometallic aromatic metalla-[n]annulenes with the ring size larger than 6, and their special aromaticity was confirmed both experimentally and theoretically. This work provides a method to construct large metalla-annulenes with different ring sizes, which
Radical cascades in synthesis. Dioxatriquinanes and doubly-annulated glycosides by triethylborane-induced atom transfer cyclization of 1,5-enynes and 1,5-diynes
作者:Thomas J. Woltering、H. Martin、R. Hoffmann
DOI:10.1016/0040-4020(95)00389-p
日期:1995.7
Tandem radical reactions listed in the title afford a convergent and flexible pathway to functionalized, heteroannular tricyclic acetals which are of relevance in natural product chemistry. The cycloisomerization of the 1,5-enyne was carried out under exceptionally mild conditions at -50 to -65 degrees C. For the first time, consecutive 5-exodigonal / 5-exo-digonaI cyclizations using 1,5-diyne systems have been accomplished again under full stereocontrol.