Controllable single- or double-oxa-Michael addition of ynones with alcohols: Synthesis of 3-alkoxyprop-2-en-1-ones and 3,3-dialkoxypropan-1-ones
Single- or double-oxa-Michael addition of ynones with various alcohols was achieved at room temperature. (E)-3-Alkoxyprop-2-en-1-ones and 3,3-dialkoxypropan-1-ones were efficiently synthesized by time-controlling approach. This protocol has advantages of