Facile Synthesis of Selenium/Sulfur-Substituted 3-Oxa-bicyclo[4.2.0]octa-1(8),5-diene and Tetrahydro-1<i>H</i>-isochromene via Sequential Three-Component Conjugate Addition/Condensation/Elimination/[2 + 2] or [4 + 2] Cyclization Reactions
作者:Jian Cao、Xian Huang、Luling Wu
DOI:10.1021/jo101905r
日期:2011.3.4
selenium/sulfur-substituted 3-oxabicyclo[4.2.0]octa-1(8),5-diene and tetrahydro-1H-isochromene from lithium alkylselenolates or alkylthiolates, 1-alkynylphosphine oxides, and aldehydes. The sequential reaction proceeds via a conjugate addition/condensation/elimination process to form the allene intermediate, which subsequently underwent [2 + 2] or [4 + 2] cyclization reaction to afford bicyclic frameworks