Ruthenium dioxide in fluoro acid medium: I. A new agent in the biaryl oxidative coupling. Application to the synthesis of non phenolic bisbenzocyclooctadiene lignan lactones.
作者:Y Landais、J.-P Robin、A Lebrun
DOI:10.1016/s0040-4020(01)80904-2
日期:——
very efficient agent for the oxidative coupling of non phenolic lignans and their derivatives, and this method was applied to the total synthesis of (+/-)-neoisostegane 2a and (+/-)-steganolide A 2b. This procedure was also used to obtain the first stereospecific synthesis of a cis-bisbenzocyclooctadiene lactone, the (+/-)-deoxyschizandrin 17, of which, was afforded by a short reduction sequence.
The total synthesis of deoxyschizandrin (1) and wuweizisu C (2) having natural configuration was accomplished and the thermal stability of biaryl configuration was confirmed.
完成了具有天然构型的脱氧五味子素(1)和无味子素C(2)的全合成,并证实了联芳构型的热稳定性。
Ruthenium(IV) (trifluoroacetate), a new oxidizing agent. II. A new access to schizandrins skeleton using biaryl oxidative coupling of -substituted butanolides
The totalsyntheses of the metabolites of schizandrin were achieved. The tetracyclic lactone intermediates (13a–e) were prepared in optically pure form by the oxidative coupling reaction of the corresponding 3-benzyl-1-benzylidenebutyrolactones. Mukaiyama hydration of 13b afforded hydroxylactone (14), which was converted into SZ-M3 (4). The introduction of C6,7-diol moiety, which is common to the metabolites