作者:David S. B. Daniels、Amber L. Thompson、Edward A. Anderson
DOI:10.1002/anie.201105720
日期:2011.11.25
cyclizations of cyclic and acyclic propargylic carbonates give 2‐alkynyl oxacycles. The reactions proceed with very high stereoselectivity for both syn‐ and anti‐disubstituted furans and pyrans, and with exceptional regioselectivity. In addition, two‐directional cyclizations of bis‐propargylic carbonate substrates yield bifurans with complete stereocontrol for all diastereomers.
氧乙炔:环状和无环炔丙基碳酸酯的钯催化环化反应产生2-炔基氧杂环。反应对顺式和反式二取代的呋喃和吡喃都具有很高的立体选择性,并具有极高的区域选择性。此外,双炔丙基碳酸酯底物的双向环化产生了对所有非对映异构体具有完全立体控制的双呋喃。