Synthesis of Amathaspiramides by Aminocyanation of Enoates
作者:Matthew O'Connor、Chunrui Sun、Daesung Lee
DOI:10.1002/anie.201503982
日期:2015.8.17
Concise routes for the total and formal syntheses of the amathaspiramides were developed through a formal [3+2] cycloaddition between lithium(trimethylsilyl)diazomethane and α,β‐unsaturated esters. The effectiveness of this new cycloaddition for the construction of Δ2‐pyrazolines containing a α‐tert‐alkylamino carbon center and subsequent facile protonolytic NN bond cleavage allows the synthesis of
revealed the importance of the amine or imine substructure on the pyrrolidine moiety and the 8R stereochemistry on the N-acyl hemiaminal moiety for the antiproliferative activity of amathaspiramide alkaloids.
Practical Asymmetric Synthesis of Amathaspiramides B, D, and F
作者:Sen-Lin Cai、Ran Song、Han-Qing Dong、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1021/acs.orglett.6b00588
日期:2016.5.6
practical asymmetric synthesis of amathaspiramides B, D, and F has been accomplished by utilizing an aza-Barbier allylation as the key step to construct the common intermediate with two adjacent stereocenters. A kinetically controlled cyclization to build the challenging thermodynamically less stable 8R-hemiaminal moiety is also important in the synthesis of amathaspiramide D. The route is readily
Six in one blow: Totalsyntheses of all the amathaspiramide alkaloids have been accomplished. Rapid construction of the diazaspiro[3.3]nonane core combined with regio‐ and diastereoselective reduction of the cyclic imide moiety with DIBAL established the route to the common structural motif. The late‐stage reduction of the lactam to an imine functionality mediated by Schwartz's reagent was the key