Synthesis of benzofused cyclobutaoxepanones <i>via</i> intramolecular annulation of <i>o</i>-cinnamyl chalcones
作者:Meng-Yang Chang、Min-Chen Tsai
DOI:10.1039/d1ob00058f
日期:——
Intramolecular stereoselective annulation of o-cinnamyloxy chalcones provides two kinds of tricyclic benzofused cyclobutaoxepanones via the synthesized routes of DABCO/NBS (1,4-diazabicyclo[2.2.2]octane/N-bromosuccinimide)-mediated Baylis–Hillman type cyclization or low-pressure mercury (LP Hg) lamp-promoted photocontrolled [2 + 2] cycloaddition. Diversified reaction conditions have been investigated
Selective Mono‐allylation of 1,3‐Diketones and Their Use in the Synthesis of 3‐Allyl Chromones and Benzannulated 6,5‐Bicyclic Ketals
作者:Brooke E. Swaney、Sinan Gai、Mitchell R. Clark、Bill C. Hawkins
DOI:10.1002/asia.201801695
日期:2019.4.15
The selectivemono‐allylation of 1,3‐diketone containing compounds is described. The reaction proceeds under mild reaction conditions and in moderate to high yield (66–99 %). Using this procedure to access the key mono‐allylated intermediate, the hitherto difficult to access 3‐allylchromones were synthesized in excellent yield (87–98 %). Finally, the utility of this newly developed procedure was showcased