Reactivity and Selectivity in the Intermolecular Alder–Ene Reactions of Arynes with Functionalized Alkenes
作者:Saswata Gupta、Peipei Xie、Yuanzhi Xia、Daesung Lee
DOI:10.1021/acs.orglett.7b02438
日期:2017.10.6
functionalized alkenes in intermolecular Alder–ene reactions with arynes is described. The arynes generated from bis-1,3-diynes react with various trisubstituted and 1,1-disubstituted alkenes containing hydroxyl, amino, halo, carboxyl, boronate, and 1,3-dienyl functionalities, providing product distributions with varying degrees of selectivity between Alder–ene and addition reactions. The geometry of
The zeolite beta induced rearrangement of substituted allyl benzyl ethers to give 4-arylbutanals was investigated with respect to the substituents in the aromatic ring. In some cases the resulting aldehydes cyclized spontaneously to give dihydronaphthalene derivatives. The rearrangement and also the ring closure to dihydronaphthalenes failed or gave poor yields in cases where too weak electron-donating
The first example of the Wittig rearrangement of furfuryl ethers is presented and its application to the preparation of 3-(2-furyl)-3-hydroxy-2-methylpropionates is described.