159991-67-0Relevant academic research and scientific papers
Good timing in total synthesis: The case of phoslactomycin A
Gebhardt, Bjoern,Koenig, Christian M.,Schleth, Cornelia,Dauber, Mario,Koert, Ulrich
supporting information; experimental part, p. 5934 - 5941 (2010/09/05)
The importance for the right order of functional group introduction and manipulation (good timing) was demonstrated in the course of a total synthesis of phoslactomycin A. The synthetic strategy comprised a CuIthiophene carboxylate (CuTC, Liebeskind's reagent)-mediated coupling to introduce the Z, Z-diene at the final stage of the synthesis in the presence of a protected phosphate. Key features for the assembly of the C1-C13 fragment were an asymmetric dihydroxylation, an Evans-aldol reaction and an advanced protective group strategy. The C14-C21 fragment was accessible via an asymmetric 1, 2-addition to cyclohexenone and a subsequent diastereoselective ketone reduction. One crucial task was the dihydroxylation of the C8-C9 alkene, the introduction of the C6-C7 double bond and the generation of the C25-nitrogen functionality. A second example consisted of the best sequence for the generation of the functional groups in the core part (first phosphorylation, second iodo-olefination, third azide/carbamate conversion). The synthetic solutions from this approach are compared with the already existing contributions in the phoslactomycin area.
Total synthesis of phoslactomycin A
Koenig, Christian M.,Gebhardt, Bjoern,Schleth, Cornelia,Dauber, Mano,Koert, Ulrich
supporting information; experimental part, p. 2728 - 2731 (2009/12/03)
A convergent total synthesis of the PP2A-inhibitor phoslactomycin A was achieved using a CuTC-mediated coupling of an alkenyl iodide C1-C13 fragment with an C14-C21 alkenyl stannane in the presence of a protected phosphate. Key features for the assembly of the C1-C13 fragment were an asymmetric dihydroxylation, an Evans-Aldol reaction, and a well-balanced protective group strategy. An asymmetric 1,4addition to cyclohexenone was the key step in the preparation of the C14-C21 fragment.
