Brønsted acid−catalyzed synthesis of tetrasubstituted allenes and polysubstituted 2H-chromenes from tertiary propargylic alcohols
作者:Natalia Cabrera-Lobera、Noelia Velasco、Roberto Sanz、Manuel A. Fernández-Rodríguez
DOI:10.1016/j.tet.2019.05.023
日期:2019.8
A practical and environmentally benign Brønstedacid−catalyzed protocol for the preparation of all-carbon tetrasubstituted allenes, consisting in the direct SNˈ addition of tri- or dimethoxy arenes or allyltrimethylsilane to tertiary propargylic alcohols, has been developed. In addition, a straightforward synthesis of densely substituted 2H-chromenes by metal-free tandem allenylation/heterocyclization
Iodo(III)-Meyer–Schuster Rearrangement of Propargylic Alcohols Promoted by Benziodoxole Triflate
作者:Roshayed Ali Laskar、Wei Ding、Naohiko Yoshikai
DOI:10.1021/acs.orglett.1c00039
日期:2021.2.5
rearrangement of propargylicalcohols into α,β-unsaturated ketones bearing an α-λ3-iodanyl group. This iodo(III)-Meyer–Schuster rearrangement proceeds under mild conditions and tolerates a variety of functionalized propargylicalcohols, thus complementing previously reported halogen-intercepted Meyer–Schuster rearrangement. The α-λ3-iodanylenones can be utilized for facile Pd-catalyzed cross-coupling for the
Synthesis of Functionalized Indenes via Cascade Reaction of Aziridines and Propargyl Alcohols
作者:Shaoyin Wang、Yuanxun Zhu、Yanguang Wang、Ping Lu
DOI:10.1021/ol901033h
日期:2009.6.18
A concise synthesis of functionalized indenes via the Lewis acid catalyzed cascadereaction of aziridines and propargylic alcohols has been developed. The methodology offers great potential for the synthesis of biologically active indene derivatives and related polycyclic compounds.
Gold(i)-catalyzed rearrangement of aryl alkynylaziridines to spiro[isochroman-4,2′-pyrrolines]
作者:Nicolas Kern、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1039/c1cc11351h
日期:——
Alkynylaziridines carrying an aryl group could be efficiently converted to spiro[isochroman-4,2'-pyrrolines] with gold salts as catalysts. This new rearrangement involved a Friedel-Craftstype intramolecular reaction followed by cyclization of the aminoallene intermediate, both initiated by the dual sigma and pi Lewis acidities of gold.