transformed into 8-methoxytetralins through the action of zirconiumtetrachloride. Yields are generally good though turnover is slow. Ultrasonic irradiation, phase transfer catalysts, crown ethers and lithium chloride all accelerate the reaction which proceeds via scission of the C-1 to C-8a bond and cyclisation by intramolecular Friedel-Crafts alkylation.
The intramolecular alkylation of arenes by higher cyclic ethers provides a stereoefficient route to tetralins
作者:David C. Harrowven、Richard F. Dainty
DOI:10.1016/s0040-4039(97)01636-5
日期:1997.10
Tetrahydrofurans and tetrahydropyrans tethered to arenes through a propyl chain readily undergo cyclisation to tetralins when exposed to titanium tetrachloride. The reaction has been shown to be highly sterospecific and an SN2 type mechanism is implicated.
当暴露于四氯化钛时,通过丙基链束缚在芳烃上的四氢呋喃和四氢吡喃很容易环化成四氢化萘。已经表明该反应具有高度立体特异性,并且牵涉到S N 2型机制。