Spirokermeline: A Macrocyclic Spirolactone from Kermadecia elliptica Brongn. & Gris

Specificity of the Antheridogen from Ceratopteris thalictroides (L.) Brongn.

Characteristics of the fern antheridogen from Ceratopteris thalictroides (L.) Brongn. are investigated. These are: (a) determination of molecular size (it is readily dialyzable), (b) pK(a) (about 5), (c) movement in thin layer chromatography, and (d) ability to induce dark germination of fern spores. These four characteristics are compared to the same characteristics of three other antheridogen...

A CONVENIENT SYNTHESIS OF MACROCYCLIC DIAMIDES

Some new macrocyclic dibenzotrioxadiamides, dibenzotetraoxadiamide, dibenzopentaoxadiamide, dibenzothiatrioxadiamide, tribenzotrioxadiamides and tetrabenzohexaoxadiamide (14-21), (26) and (27) have been prepared. These compounds were obtained in the macrocyclization step by reacting the diamine (4) with appropriak dicaxboxylic acid dichlorides (5-13) and (24). The cyclization does not requ...

Isolation and identification macrocyclic spermine alkaloid(protoverbine) from verbascum speciosum.

The 17-membered macrocyclic spermine alkaloid protoverbine (8-phenyl-1,5,9,13-tetra azacycloheptadecan-6-one) was isolated From the aerial part of verbascum speciosum. The natural polyamines are ubiquitous bases reported to have several important functions in animals, plants and microorganisms. They are involved in processes of transcription and translation in protein synthesis and influence gr...

Indole Alkaloids from Ochrosia elliptica Plant Cell Suspension Cultures

From cell suspension cultures of Ochrosia elliptica Labill. eight different monoterpenoid indole alkaloids were isolated and comprised three alkaloid classes viz. Corynanthe/Heteroyohimbine (tetrahydroalstonine, cathenamine, pleiocarpamine and two methoxylated heteroyohimbines), Strychnos (norfluorocurarine), Apparicine (apparicine and epchrosine). All these compounds except the Strychnos alkal...

WSI GRIS Compression of Discrete Multiresolution Models