Photoredox‐Catalyzed Cyclobutane Synthesis by a Deboronative Radical Addition–Polar Cyclization Cascade
作者:Chao Shu、Adam Noble、Varinder K. Aggarwal
DOI:10.1002/anie.201813917
日期:2019.3.18
single‐electron transfer induced deboronative radicaladdition to an electron‐deficient alkene followed by single‐electron reduction and polar 4‐exo‐tet cyclization with a pendant alkyl halide. Key to the success of the methodology was the use of easily oxidizable arylboronate complexes. Structurally diverse cyclobutanes are shown to be conveniently prepared from readily available alkylboronic esters and
Preparation of methyl-2-(ω-iodoalkyl)propenoates and a facile route to 2-carbomethoxy-1,3-butadiene
作者:Alex I.D. Alanine、Colin W.G. Fishwick、Andrew D. Jones、Michael B. Mitchell
DOI:10.1016/s0040-4039(01)93823-7
日期:1989.1
α-Methylene-γ-andδ-lactones undergo facile ring opening with trimethylsilyl iodide to yield 2-(iodoethyl)propenoic acid and 2-(iodopropyl)propenoic acid respectively, which are methylated to afford the corresponding esters. Treatment of methyl-2-(iodoethyl)propenoate with base generates 2-carbomethoxy-1,3-butadiene which undergoes dimerisation or can be trapped in-situ.