Hypoiodite-catalysed oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds: a facile and versatile approach to substituted furans and cyclopropanes
Through hypoiodite catalysis, the oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds for divergent synthesis of either furans or cyclopropanes is developed. The selective synthesis of major products...
The [3 + 2] annulations of γ-butyrolactone fused donor–acceptor (D–A) cyclopropanes with aromatic isothiocyanates and dialkyl carbodiimides promoted by FeCl3 is reported. A series of bicyclic/polycyclic γ-butyrolactone fused thioimidates and γ-butyrolactone fused amidines containing four contiguous stereogenic centers were obtained in excellent yields as single stereoisomers.
Solvent-Controlled Oxidative Cyclization for Divergent Synthesis of Highly Functionalized Oxetanes and Cyclopropanes
作者:Yang Ye、Chen Zheng、Renhua Fan
DOI:10.1021/ol9012102
日期:2009.7.16
An efficient solvent-controlled oxidative cyclization of Michael adducts of malonates with chalcones with the combination of iodosobenzene and tetrabutylammonium iodide is reported. Highly functionalized oxetanes and cyclopropanes were divergently synthesized in moderate to excellent yields with high diastereoselectivity.
Highly Diastereoselective Synthesis of 1-Pyrrolines <i>via</i> SnCl<sub>4</sub>-Promoted [3 + 2] Cycloaddition between Activated Donor–Acceptor Cyclopropanes and Nitriles
作者:Gopal Sathishkannan、Kannupal Srinivasan
DOI:10.1021/ol2024423
日期:2011.11.18
Activated donor–acceptor cyclopropanes underwent formal [3 + 2] cycloaddition with nitriles in the presence of SnCl4. The product 1-pyrrolines were isolated as single cis-diastereomers in moderate to good yields.
Scandium(III) Triflate-Catalyzed Reaction of Aroyl-Substituted Donor–Acceptor Cyclopropanes with 1-Naphthylamines: Access to Dibenzo[<i>c</i>,<i>h</i>]acridines
作者:Murugesan Thangamani、Kannupal Srinivasan
DOI:10.1021/acs.joc.0c02105
日期:2021.1.1
The reaction of aroyl-substituted donor–acceptor (D–A) cyclopropanes with two equivalents of 1-naphthylamines in the presence of a catalytic amount of scandium(III) triflate provides access to dibenzo[c,h]acridines. The key steps of the transformation are the formation of nucleophilic ring-opening products from the D–A cyclopropanes and 1-naphthylamines and their subsequent fragmentation and cyclization