Skeletal transformation of α-pyrones having electron-withdrawing groups at 3,5-positions into ring-fused dihydrofurans
作者:Toru Tanaka、Takuya Miura、Shoki Inoue、Hiroki Iwasaki、Minoru Ozeki、Naoto Kojima、Masayuki Yamashita
DOI:10.1016/j.tetlet.2015.09.059
日期:2015.11
5-positions into dihydrofurans was developed. Using dimethylsulfoxonium methylide as the methylene-transfer reagent, the α-pyrones were converted into dihydrofurans as major products and 1-methylthiopyran-1-oxides as minor products. The selectivity of the dihydrofuran formation was improved by optimizing the reaction conditions.
已经开发出在3,5-位具有吸电子基团的α-吡喃酮骨架转化为二氢呋喃。用二甲基亚砜基亚甲基作为亚甲基转移试剂,将α-吡喃酮转化成二氢呋喃作为主要产物,并转化成1-甲基硫代吡喃-1-氧化物作为次要产物。通过优化反应条件提高了二氢呋喃形成的选择性。