Benzocyclobutadienes: An Unusual Mode of Access Reveals Unusual Modes of Reactivity
作者:Xiao Xiao、Brian P. Woods、Wen Xiu、Thomas R. Hoye
DOI:10.1002/anie.201803872
日期:2018.7.26
The reaction of an aryne with an alkyne to generate a benzocyclobutadiene (BCB) intermediate is rare. We report here examples of this reaction, revealed by Diels–Alder trapping of the BCB by either pendant or external electron‐deficient alkynes. Mechanistic delineation of the reaction course is supported by DFT calculations. A three‐component process joining the benzyne first with an electron‐rich
Callipeltoside A: Total Synthesis, Assignment of the Absolute and Relative Configuration, and Evaluation of Synthetic Analogues
作者:Barry M. Trost、Janet L. Gunzner、Olivier Dirat、Young H. Rhee
DOI:10.1021/ja0205232
日期:2002.9.1
alkylation (AAA). The novelty of the latter protocol is its control of regioselectivity as well as absolute configuration. The trisubstituted olefin is generated using an alkene-alkyne coupling to create a trisubustituted olefin with complete control of geometry. The excellent chemo- and regioselectivity highlights the synthetic potential of this new ruthenium catalyzed process. The macrolactonization employs