Metal Template<i>ortho</i>-Acylation of Phenols. Direct Synthesis of Salicylic Acid Chlorides and Derivatives
作者:Giovanni Sartori、Giuseppe Casnati、Franca Bigi、Giovanni Bonini
DOI:10.1055/s-1988-27701
日期:——
A direct synthesis of salicylic acid chlorides is achieved via "metal-driven" intracomplex acylation of bromomagnesium and aluminum phenoxides with phosgene. Salicylic acids 5 and some derivatives 6, 7 can be obtained by quenching the reaction mixture with convenient reagents. Moreover the reaction of lithium phenylacetylide with 3 provides a new convenient approach to ortho-hydroxyaryl alkynyl ketones like 8. The oriented complex 2, involving the metal phenoxide and phosgene is proposed to account for the ortho-regioselective control of the reaction.
通过“金属驱动”的复合体内酰化反应,溴化镁和铝酚氧化物与光气反应,直接合成水杨酸氯化物。通过使用合适的试剂淬灭反应混合物,可以获得水杨酸及其一些衍生物。此外,锂苯乙炔与3的反应提供了一种新颖且便捷的方法,以合成类似8的邻羟基芳烃炔基酮。建议的定向复合体2包含金属酚氧化物和光气,旨在解释该反应的邻位区域选择性控制。