nor-ketone XI with steroid models. Thus it was shown that di- or tri-bromination of 4α-methyldihydrotestosterone acetate leads to 2α,6β-dibromo-4-methyl-testosterone acetate, also obtainable by dibromination of 4-methyltestosterone acetate. Rotatory dispersion studies of relevant iresin and steroid model compounds demonstrate that this sesquiterpene possesses the “wrong” absoluteconfiguration as compared
Terpenoids. XXIX.<sup>1</sup> Iresin (Part 2).<sup>2</sup> A New Fundamental Sesquiterpene Skeleton<sup>3,4</sup>
作者:Carl Djerassi、Werner Rittel
DOI:10.1021/ja01570a061
日期:1957.7
Total Synthesis of (+)-Iresin
作者:Bian-Lin Wang、Hai-Tao Gao、Wei-Dong Z. Li
DOI:10.1021/acs.joc.5b00365
日期:2015.5.15
The first asymmetric total synthesis of (+)-iresin (4), an historically important ent-Drimane sesquiterpene lactone, was realized from aldehyde 3 viacyclic orthoester 6 in 5 steps. Notable transformations in this synthesis include a tandem trifluoroperacetic acid (TFPAA)-mediated Baeyer–Villiger oxidation–olefin epoxidation–epoxy ester cyclization, regioselective Burgess dehydration, and regioselective