Anionic Homologous Fries Rearrangement of O-(2-Methylaryl)carbamates. A Regiospecific Route to Benzo[b]furan-2(3H)-ones including an Unnamed Metabolite from Helenium Species
摘要:
一种新的 LDA 介导的 O → C 氨基甲酰基迁移 3 为芳基乙酰胺 5(苯并呋喃酮和萘并呋喃酮 7 的前体)提供了一条普遍而有效的途径,其中一种芳基乙酰胺 5 可作为简短合成从几种 Helenium 植物中分离出来的天然苯并呋喃内酯 11 的起始原料。
Anionic Homologous Fries Rearrangement of O-(2-Methylaryl)carbamates. A Regiospecific Route to Benzo[b]furan-2(3H)-ones including an Unnamed Metabolite from Helenium Species
摘要:
一种新的 LDA 介导的 O → C 氨基甲酰基迁移 3 为芳基乙酰胺 5(苯并呋喃酮和萘并呋喃酮 7 的前体)提供了一条普遍而有效的途径,其中一种芳基乙酰胺 5 可作为简短合成从几种 Helenium 植物中分离出来的天然苯并呋喃内酯 11 的起始原料。
Application of directed metalation in synthesis. Part 6: A novel anionic rearrangement under directed metalation conditions leading to heteroannulation
作者:Tarun Kanti Pradhan、Chandrani Mukherjee、Sukanta Kamila、Asish De
DOI:10.1016/j.tet.2004.04.033
日期:2004.6
from easily available phenols is described. The key step in this synthesis is a hitherto unreported anionic rearrangement under directed metalation conditions. The rearrangement occurs after side chain deprotonation of a methyl sulfanyl group by an O-carbamate directed metalating group and the reaction mixture is kept at room temperature for 8–12 h. Acid-mediated cyclisation of the rearranged product