<i>Bis</i>-enolates with Extended π-Conjugation Are Powerful Nucleophiles: A Study of Their Alkylation Reactions with Very Hindered C-Electrophiles
作者:Mariña Castroagudín、Rubén Lobato、Lucas Martínez-García、F. Javier Sardina、M. Rita Paleo
DOI:10.1021/acs.joc.9b01961
日期:2019.12.20
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。