Bis-enolates with extended π-conjugation, prepared by alkali metal-mediated reduction of several aromatic and unsaturated diesters, can be efficiently and regioselectively alkylated with very hindered C-electrophiles, such as neopentyl, secondary and tertiary alkyl halides, and tosylates. A one-step synthesis of 4-alkyl phthalates was derived from the reductive alkylation of a phthalate diester with hindered
通过碱
金属介导的几种芳族和不饱和二酯还原反应制备的具有扩展π共轭的双烯醇化物可以通过非常受阻的C-亲电试剂(例如新戊基,仲和叔烷基卤化物)和甲
苯磺酸盐高效地进行区域选择性烷基化。
邻苯二甲酸4-烷基酯的一步合成是通过
邻苯二甲酸二酯与受阻卤化物的还原烷基化反应,然后再用
氧气进行重新
麦芽糖化而完成的。另外,已经开发了合成方案以仅一步或两步就可以有效地从
邻苯二甲酸二异丙酯制备复杂的稠合或螺二环自行车。