The absolute configuration of polycephalin C from the slime mold Physarum polycephalum (Myxomycetes)
作者:Florian Blumenthal、Kurt Polborn、Bert Steffan
DOI:10.1016/s0040-4020(02)01051-7
日期:2002.10
The absolute configuration of polycephalin C (1) isolated from plasmodia of the slime mold Physarum polycephalum is supposed to be 3″R,4″R as found by comparison of CD spectra of the naturalproduct polycephalin C (1) and CD spectra of synthetic bis-benzoates (−)-4 and (+)-4. An X-ray structure of the corresponding bis-camphanate (+)-3 shows that the excitonchiralitymethod may not be applied on these
Illumination results in increased formation of metabolites 1 and 2 in the plasmodia of the slime mold Physarum polycephalum. This was determined from HPLC studies undertaken in the search for the photoactive substances involved in the "blue-light phenomenon". The isolation and structureelucidation of 1 and 2 is described.
Total synthesis of the polyenoyltetramic acid polycephalin C
作者:Deborah A Longbottom、Angus J Morrison、Darren J Dixon、Steven V Ley
DOI:10.1016/s0040-4020(03)00816-0
日期:2003.8
The total synthesis of the polyenoyltetramic acid polycephalin C is described. Key steps of the synthesis include a double Swern oxidation, double Takai reaction and a double Stille reaction. In addition, the absolute stereochemistry of the ring junction has been determined by synthesis of both isomers and comparison of their CD spectra with natural polycephalin C. (C) 2003 Elsevier Ltd. All rights reserved.
Formation of macrocyclic structures by use of the diels-alder reaction