Synthesis of 1,2-five-ring-annellated barrelenesvia the intramolecularDiels-Alder reaction of acetylenic derivatives
作者:Latchezar S. Trifonov、Alexander S. Orahovats
DOI:10.1002/hlca.19870700708
日期:1987.11.4
The intramolecular Diels-Alder reaction conducted with acetylenic acylureas, obtained from carbodiimides, and the acetylenic acid 5 and its derivatives 13 gave the 1,2-annellated barrelene 14 (from 13a) and the benzobarrelenes 8 (from 5) and 15 (from 13b); in the case of 3-butynoic acid (1),[1,3]-H shift were observed. The formation of the azabarrelenes 16 (from 13c) as an intermediate is postulated
用从碳二亚胺得到的炔基酰脲和炔酸5及其衍生物13进行的分子内Diels-Alder反应,得到1,2-退火的桶烯14(来自13a)和苯并桶烯8(来自5)和15(来自13b)); 在3-丁酸(1)的情况下,观察到[1,3] -H位移。假定形成作为中间体的氮杂bar烯16(来自13c),其使HCN松散而得到吲哚酮17。酰基脲6和9 进行异氰酸酯裂解而不是[4 + 2]环化。