Palau'amine

Palau'amine

Names
Systematic IUPAC name 2,2'-Diamino-11-(aminomethyl)-12-chloro-1,1',3a,5',10a,11,12,13a-octahydro-5'-hydroxy-spiro[8H-cyclopenta[3,4]pyrrolo[1,2-a]imidazo[4,5-b]pyrrolo[1,2-d]pyrazine-13(10H),4'-[4H]imidazol]-8-one[1]
Identifiers
CAS Number	148717-58-2
ChEMBL	ChEMBL2079438
ChemSpider	17279008
Jmol interactive 3D	Image
MeSH	C438976
PubChem	16122048
InChI InChI=1S/C17H22ClN9O2/c18-10-6(4-19)7-5-27-11(28)8-2-1-3-26(8)12-17(27,25-14(20)22-12)9(7)16(10)13(29)23-15(21)24-16/h1-3,6-7,9-10,12-13,29H,4-5,19H2,(H3,20,22,25)(H3,21,23,24)/t6-,7-,9+,10+,12+,13+,16+,17-/m1/s1 Key: VYOQBYCIIJYKJA-VORKOXQSSA-N InChI=1/C17H22ClN9O2/c18-10-6(4-19)7-5-27-11(28)8-2-1-3-26(8)12-17(27,25-14(20)22-12)9(7)16(10)13(29)23-15(21)24-16/h1-3,6-7,9-10,12-13,29H,4-5,19H2,(H3,20,22,25)(H3,21,23,24)/t6-,7-,9+,10+,12+,13+,16+,17-/m1/s1 Key: VYOQBYCIIJYKJA-VORKOXQSBL
SMILES Cl[C@@H]4[C@@]1(NC(=N/[C@H]1O)\N)[C@H]3[C@@]26/N=C(\N[C@H]6n5c(C(=O)N2C[C@@H]3[C@H]4CN)ccc5)N
Properties
Chemical formula	C17H22ClN9O2
Molar mass	419.87 g·mol^−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Palau'amine is a toxic alkaloid compound synthesized naturally by Stylotella agminata, a species of sea sponge found in the southwest Pacific Ocean. The name of the molecule derives from the island nation of Palau, near which the sponges are found.

The substance was first isolated and described in 1993.^[2] Containing nine nitrogen atoms, the molecule is considered highly complex. The precise atomic structure was pinned down in 2007,^[3] and two years later the molecule was synthesized in the lab by a team at the Scripps Research Institute in La Jolla, California.^[4][5]

Biosynthesis

A pathway to this dimeric pyrrole-imidazole alkaloid has been hypothesized to include a key oxidation of a β-ketoester with Mn(OAc)₃ initiated a cascade radical cyclization sequence to deliver an ageliferin skeleton.^[6]

References

1. Chemical Abstracts, accessed via SciFinder, version 2004.2; Chemical Abstracts Service: Columbus, OH, 2004; RN 148717-58-2
2. Kinnel, Robin B.; Gehrken,, Henning Peter; Scheuer, Paul J. (1993). "Palau'amine: a cytotoxic and immunosuppressive hexacyclic bisguanidine antibiotic from the sponge Stylotella agminata". Journal of the American Chemical Society 115 (8): 3376–3377. doi:10.1021/ja00061a065.
3. Halford, Bethany (2007). "Sponge Alkaloids: Palau'amine Reconsidered". Chemical & Engineering News 85 (10): 12. doi:10.1021/cen-v085n010.p012a.
4. Seiple, Ian B.; Su, Shun; Young, Ian S.; Lewis, Chad A.; Yamaguchi, Junichiro; Baran, Phil S. (2010). "Total Synthesis of Palauamine". Angewandte Chemie International Edition 49: 1095. doi:10.1002/anie.200907112.
5. Madrigal, Alexis (2010-01-14). "Bizarre Sea Sponge Compound Finally Synthesized by Humans". Retrieved 2010-01-15.
6. Ma Z, Lu J, Wang X, Chen C (Jan 7, 2011). "Revisiting the Kinnel-Scheuer hypothesis for the biosynthesis of palau'amine". Chem Commun (Camb) 47 (1): 427–9. doi:10.1039/c0cc02214d. PMC 2999656. PMID 20848010.