The Preparation of Substituted 3,4-Dihydro-1H-2-benzopyran-1-ones from the Dianions of<i>Ortho</i>-Toluic Acids
作者:Karen C. Hildebran、Tracy L. Cordray、Kam W. Chan、Charles F. Beam
DOI:10.1080/00397919408011300
日期:1994.3
Abstract The dianions of ortho-toluic and α-phenyl-ortho-toluic acids were prepared with lithium diisopropylamide (LDA), condensed with certain aldehydes or ketones, and the resulting intermediates were acid-cyclized to substituted 3,4-dihydro-1H-2-benzopyran-1-ones (dihydroisocoumarins).
摘要 以二异丙基氨基锂 (LDA) 为原料制备邻甲苯甲酸和 α-苯基邻甲苯甲酸的二价阴离子,并与某些醛或酮缩合,所得中间体经酸环化得到取代的 3,4-二氢-1H- 2-benzopyran-1-ones(二氢异香豆素)。