γ-Oxygenated-α,β-unsaturated sulfones in radical cyclizations and cascade processes
作者:Javier Adrio、Juan C Carretero
DOI:10.1016/s0040-4020(97)10368-4
日期:1998.2
(substrates 1–4) have been prepared. Both 5-hexenyl and 6-heptenyl radicals, generated by reaction of substrates 1–4 with Bu3SnH/AIBN, underwent an efficient cyclization via intramolecular addition to the vinyl sulfone moiety. By introduction of a double bond joined to the oxygen at γ-position, a cascade process based on two sequential radical cyclizations took place, affording highly substituted 2-oxa[3
制备了多种具有γ-氧化的α,β-不饱和砜结构的自由基前体(底物1-4)。底物1-4与Bu 3 SnH / AIBN的反应产生的5-己烯基和6-庚烯基均通过分子内加成至乙烯基砜部分而进行了有效的环化。通过引入一个在γ位置连接氧的双键,进行了基于两个连续自由基环化的级联过程,得到了高度取代的2-oxa [3.3.0]或9-oxa [4.3.0]双环化合物。