Provided is a fluoroboron compound which is highly safe and stable and is capable of forming a cyclic ether-fused ring by the intramolecular alkoxymethylation reaction, or a salt thereof. The compound can be synthesized by the intramolecular alkoxymethylation reaction of a fluoroboron compound represented by the formula (I) or a salt thereof in the presence of a metal catalyst.
(wherein the moiety represented by the formula
represents an aromatic ring; L represents a substituent such as a halogen atom; R represents a substituted or unsubstituted alkylene group having 1 or 2 carbon atoms; and M represents an alkali metal cation or the like, with the proviso that L and —R—OCH
2
BF
3
M are respectively located on contiguous carbon atoms on the aromatic ring, or in the case of a fused aromatic ring, on two carbon atoms adjacent to one carbon at the fused position).
提供的是一种高度安全和稳定的
氟硼化合物,能够通过分子内烷氧甲基化反应形成环状醚融合环,或其盐。该化合物可以在
金属催化剂存在下,通过公式(I)表示的
氟硼化合物或其盐的分子内烷氧甲基化反应合成。(其中由公式表示的基团代表芳香环;L代表取代基,如卤素原子;R代表取代或未取代的1或2个碳原子的烷基;M代表碱
金属阳离子等,条件是L和-R-OCH2BF3M分别位于相邻的芳香环碳原子上,或在融合芳香环的情况下,在相邻的两个碳原子上,且其中一个碳原子在融合位置上)。