作者:R. Alan Aitken、Da Chang
DOI:10.3987/com-15-s(t)14
日期:——
A new domino approach to flavones by gas phase pyrolysis of β,γ-dioxophosphonium ylides containing a 2-methoxyphenyl group is frustrated by unexpected and novel decarbonylation of the intermediate flavon-3-yl radical leading to 2-phenylbenzofuran. Alternative approaches based on dioxolane protection of one carbonyl, or selective elimination in β,β'-dioxo or β-oxo-β'-thioxo ylides were not successful
一种通过气相热解含有 2-甲氧基苯基的 β,γ-二氧磷叶立德来制备黄酮的新多米诺骨牌方法因中间体黄酮-3-基自由基的意外和新颖的脱羰反应而受挫,导致 2-苯基苯并呋喃。基于二氧戊环保护一个羰基或选择性消除 β,β'-二氧代或 β-氧代-β'-硫代叶立德的替代方法并不成功,但 β-氧代-β'-苯基亚氨基叶立德的热解确实给出了所需的多米诺骨牌反应导致中等收率的受保护的苯并吡喃酮。