A total synthesis of the unique epoxy-lactone alliacolide (3), featuring a novel, stereoselective intramolecular radical cyclisation onto an enolic double-bond, (13) → (14), as a key step, is described.
The isoprene units of the sesquiterpenoid, alliacolide
作者:A. Peter W. Bradshaw、James R. Hanson
DOI:10.1039/c39810000631
日期:——
The enrichment and labelling patterns of alliacolide derived biosynthetically from [1-13C]- and [1,2-13C2]-acetate have been used to define the isopreneunits in the alliacane skeleton.
A Stereoselective Total Synthesis of (.+-.)-Alliacol A and Congeners of Marasmius Alliaceus
作者:James J. La Clair、Peter T. Lansbury、Ben-xin Zhi、Karst Hoogsteen
DOI:10.1021/jo00120a027
日期:1995.7
Synthesis of alliacolide(1), alliacol A (2), and 12-noralliacolide (4), members of the alliacane family of sesquiterpene lactones, was accomplished through both syn- and anti-modes of intramolecular S-N' displacement. Two routes to 12-noralliacolide (4) are presented, which contrast brevity and efficiency in stereoselection (i.e. 14 --> 16/17 versus 37a/b --> 38). Since both routes culminate in C-ring annulation, introduction of the correct stereochemical arrangement relied heavily on the structural features of the hydrindane (AB) precursor(s). Choice of the proper AB system 24 facilitated production of tetrahydrofuran 38. With the full skeleton in place, 38 was efficiently epoxidized and oxidized to 4. 12-Noralliacolide (4) served as an appropriate relay substrate for conversion to alliacol A (2) and several other alliacanes.
Ladlow, Mark; Pattenden, Gerald, Journal of the Chemical Society. Perkin transactions I, 1988, p. 1107 - 1118
作者:Ladlow, Mark、Pattenden, Gerald
DOI:——
日期:——
Bradshaw, A. Peter W.; Hanson, James R.; Sadler, Ian H., Journal of the Chemical Society. Perkin transactions I, 1982, # 11, p. 2787 - 2790
作者:Bradshaw, A. Peter W.、Hanson, James R.、Sadler, Ian H.