Synthesis of skeletally diverse alkaloid-like molecules: exploitation of metathesis substrates assembled from triplets of building blocks
作者:Sushil K Maurya、Mark Dow、Stuart Warriner、Adam Nelson
DOI:10.3762/bjoc.9.88
日期:——
A range of metathesis substrates was assembled from triplets of unsaturated building blocks. The approach involved the iterative attachment of a propagating and a terminating building block to a fluorous-tagged initiating building block. Metathesis cascade chemistry was used to "reprogram" the molecular scaffolds. Remarkably, in one case, a cyclopropanation reaction competed with the expected metathesis
Synthesis of Natural-Product-Like Molecules with Over Eighty Distinct Scaffolds
作者:Daniel Morton、Stuart Leach、Christopher Cordier、Stuart Warriner、Adam Nelson
DOI:10.1002/anie.200804486
日期:2009.1
Seeking scaffold diversity: A synthetic approach for the combinatorial variation of the scaffolds of small molecules is described. Using just six basic reaction types, compounds with 84 distinctscaffolds were prepared. The compounds had many natural‐product‐like structural features including rich stereochemistry, heterocyclic and unsaturated ring systems, and dense functionalization.
Cycloaddition Reactions of Azide, Furan, and Pyrrole Units with Benzynes Generated by the Hexadehydro-Diels–Alder (HDDA) Reaction
作者:Thomas R. Hoye、Junhua Chen、Beeraiah Baire
DOI:10.3987/com-13-s(s)83
日期:——
Benzynes can be generated by the intramolecular thermal cycloisomerization of triynes-the title HDDA reaction. We report here that these can be trapped by cycloaddition reaction with trimethylsilyl azide (1,3-dipolar) or a furan or pyrrole (4+2 Diels-Alder).
(HDDA) reaction converts a 1,3-diyne bearing a tethered alkyne (the diynophile) into bicyclic benzyneintermediates upon thermal activation. With only a few exceptions, this unimolecular cycloisomerization requires, depending on the nature of the atoms connecting the diyne and diynophile, reaction temperatures of ca. 80–130 °C to achieve a convenient half-life (e.g., 1–10 h) for the reaction. In this