Minor and trace sterols in marine invertebrates 53: Further novel marine sterols resulting from triple and quadruple biomethylation of the cholesterol side-chain
摘要:
The isolation and structure elucidation of nine new trace sterols with highly branched side chains from a Pseudaxinyssa species from the Australian Great Barrier Reef are described.
and (24S)-samples that were synthesized in routes involving the orthoesterClaisenrearrangement of Δ23-22-allylic alcohols. This is the first synthetic study where the Claisenrearrangement is used to introduce a C-24 quaternary center in a stereospecific manner with acceptable yield. X-ray analysis of 1 confirmed these stereochemical assignments.
Minor and trace sterols in marine invertebrates 40. Structure and synthesis of axinyssasterol, 25-methylfucosterol and 24-ethyl-24-methylcholesterol -- novel sponge sterols with highly branched side chains
作者:Xian Li、Carl Djerassi
DOI:10.1016/s0040-4039(00)81493-8
日期:1983.1
The isolation, structure determination and synthesis of three novel sterols with unusual side chains is reported. A consistent scheme is proposed which accounts for the biosynthesis of all major and minorsterols in this sponge.
Minor and trace sterols in marine invertebrates 53: Further novel marine sterols resulting from triple and quadruple biomethylation of the cholesterol side-chain
作者:T.B. Tam Ha、W.C.M.C. Kokke、John R. Proudfoot、Carl Djerassi、Janice Thompson
DOI:10.1016/0039-128x(85)90075-3
日期:1985.3
The isolation and structure elucidation of nine new trace sterols with highly branched side chains from a Pseudaxinyssa species from the Australian Great Barrier Reef are described.