259794-28-0Relevant articles and documents
Total synthesis and conformational studies of ceratospongamide, a bioactive cyclic heptapeptide from marine origin
Yokokawa, Fumiaki,Sameshima, Hirofumi,In, Yasuko,Minoura, Katsuhiko,Ishida, Toshimasa,Shioiri, Takayuki
, p. 8127 - 8143 (2007/10/03)
The first total synthesis of cis,cis-ceratospongamide (cyclo[L-Pro-L-Ile-Me-oxazoline-L-Phe-L-Pro-thiazole-L-Phe-]) was accomplished and confirmed by X-ray crystal analysis. The heating of cis,cis-ceratospongamide in DMSO converted it not to the trans,trans isomer but to the trans,trans-[D-allo-Ile]-ceratospongamide, which was confirmed by total synthesis. Its solution conformation was constructed by the dynamic simulated annealing method using ROE cross peaks, revealing a rounded and flat ring structure which is in contrast with the slim and tight structure of cis,cis isomer. The results shows that the trans,trans-[D-allo-Ile] isomer is the main thermal product of cis,cis-ceratospongamide.
Kinetic control of proline amide rotamers: Total synthesis of trans,trans- and cis,cis-ceratospongamide
Deng, Shaojiang,Taunton, Jack
, p. 916 - 917 (2007/10/03)
Ceratospongamide is a cyclic peptide natural product that is biosynthesized as a mixture of two proline rotamers. Remarkably, these rotamers do not detectably interconvert at temperatures up to 100 °C. Here we report high-yielding syntheses of each rotame
Total synthesis of cis,cis-ceratospongamide, a bioactive thiazole-containing cyclic peptide from marine origin
Yokokawa,Sameshima,Shioiri
, p. 986 - 988 (2007/10/03)
The first total synthesis of cis,cis-ceratospongamide (1a), isolated from marine source, was accomplished via thiazole synthesis using CMD methodology, DEPC-mediated peptide coupling, macrolactamization, and cyclodehydration. Comparison of the cyclization sites and coupling reagents in the macrolactamization step was also investigated.