Benzotriazole-Assisted Aromatic Ring Annulation: Efficient and General Syntheses of Polysubstituted Naphthalenes and Phenanthrenes
作者:Alan R. Katritzky、Guifen Zhang、Linghong Xie
DOI:10.1021/jo961597x
日期:1997.2.1
4-addition to alpha,beta-unsaturated aldehydes and ketones. Intramolecular cyclization of the products, induced by acetic acid-hydrobromic acid or polyphosphoric acid (PPA), followed by simultaneous dehydration and debenzotriazolylation furnishes a wide range of polysubstituted naphthalenes 7a-f and of phenanthrenes 9 and 11 in moderate to good yields in one-pot procedures. If compounds 1 are first lithiated
易于从苄基溴和苯并三唑获得的(苯并三唑-1-基甲基)苯和-萘1a-f容易进行锂化反应,随后将1,4-加成到α,β-不饱和醛和酮上。由乙酸-氢溴酸或多磷酸(PPA)引起的产物的分子内环化,然后同时脱水和脱苯并三唑基甲酸酯化,可提供中等价位到良好收率的多种多取代萘7a-f和菲9和11。锅程序。如果首先将化合物1锂化并与亲电试剂反应,则所得的烷基化产物会与α,β-不饱和羰基化合物进行类似的环化反应,从而以中等的总收率提供更高取代度的萘6a,b和菲10a,b。