Rhodium carbenoid O-H insertion reactions with phenols; A facile method for the synthesis of trialkyl 2-aryloxyphosphonoacetates and their use in the preparation of 2-aryloxy-3-phenylpropanoates.
作者:David Haigh
DOI:10.1016/s0040-4020(01)81116-9
日期:1994.3
cyclises to lactone 9. Aniline inserts preferentially and exclusively over phenol in a competition reaction with 7 to afford an anilinophosphonoacetate 11. Phenol insertion products 5 are shown to be versatile intermediates in a novel preparation of 2-aryloxy-3-phenylpropenoates 12 by Wadsworth-Emmons reaction with benzaldehydes. Dissolving magnesium metal reduction provides a mild method for the conversion
各种取代的苯酚与2-重氮膦酰基乙酸三烷基酯7进行容易的且迄今未报道的铑类胡萝卜素介导的OH插入反应,以通常良好至优异的收率得到相应的三烷基2-芳氧基膦酰基乙酸酯5。含有强吸电子基团,庞大的邻位取代基或某些邻位杂原子取代基的酚显示出降低的或可变的产率。邻苯二酚提供一个加成物,可环化成内酯9。苯胺在与7的竞争反应中优先且仅在苯酚上插入,从而获得苯胺基膦酰基乙酸酯11。苯酚插入产品5在Wadsworth-Emmons反应中与苯甲醛反应制备2-芳氧基-3-苯基丙酸酯12的新型制备物中,它们被证明是通用的中间体。溶解镁金属还原提供了一种温和的方法,用于将丙酸酯12转化为相应的丙酸酯13。