Synthesis of 3-alkyl-8-substituted- and 4-hydroxy-8-substituted-2,3,4,5-tetrahydro-1<i>H</i>-2-benzazepines
作者:Gary L. Grunewald、Vilas H. Dahanukar
DOI:10.1002/jhet.5570310656
日期:1994.11
Based on the Schmidt reaction and an iodolactone ring expansion reaction, two different synthetic routes to substituted 2,3,4,5-tetrahydro-1H-2-benzazepines were developed. The Schmidt reaction on 2,3-dihydro-2H-1-naphthalenone (1) gave 3, the product resulting from the alkyl group migration, as the major product instead of the tetrazole 2. This prompted the investigation of the Schmidt reaction on
基于Schmidt反应和碘内酯扩环反应,开发了两种不同的合成途径来取代2,3,4,5-四氢-1 H -2-苯并ze庚因。2,3-二氢-2-施密特反应ħ -1-萘酮(1),得到3,从烷基转移得到的产物,作为主要产物,而不是四唑2.这促使在施密特反应的调查芳族酮8和12。由于烷基的迁移,产物9是在2-甲基-3,4-二氢-2 H -1-萘酮(8)上进行Schmidt反应的主要产物。β-酮二酯施密特反应后,图12给出了脱碳-氧化内酰胺的混合物。在这种情况下,由芳环的迁移引起的内酰胺13在另一内酰胺14上占优势。当内酰胺14进行硝化时,产生单一的区域异构体并转化为溴醇19。在甲醇氨的存在下,将碘内酯22单锅扩环成内酰胺23。碘代内酯22可以很容易地由2-烯丙基苯甲酸制备。