Synthesis and rearrangement of [1,1′-bicyclobutyl]-1-ols and spiro[3.4]octan-5-ols: a general access to bicyclo[3.3.0]octenes (hexahydropentalenes)
作者:Klaus Mandelt、Imelda Meyer-Wilmes、Lutz Fitjer
DOI:10.1016/j.tet.2004.09.074
日期:2004.12
generated and added to cyclobutanones to yield mono- to trimethylated [1,1′-bicyclobutyl]-1-ols. Mono- to trimethylated spiro[3.4]octan-5-ols have been prepared from the parent ketone via alkylation and/or addition reactions. Upon treatment with acid, all [1,1′-bicyclobutyl]-1-ols and spiro[3.4]octan-5-ols rearrange to yield a single bicyclo[3.3.0]octene.
Sterically demanding Csp<sup>2</sup>(<i>ortho</i>-substitution)–Csp<sup>3</sup>(tertiary) bond formation <i>via</i> carboxylate-directed Mizoroki-Heck reaction under extra-ligand-free conditions
作者:Wei Zeng、Ai-Wen Chen、Ming-Jie Yan、Jie Wang
DOI:10.1039/d3ob01784b
日期:——
Construction of the sterically demanding Csp2(oS)–Csp3(T) bond was achieved by carrying out the Pd-catalyzed carboxylate-directed Mizoroki-Heck reaction under extra-ligand-free aqueous conditions. The cooperative role of the presence of water with the absence of phosphine ligand was proposed to accelerate the migratoryinsertion process considerably, delivering a broad substrate scope.