Synthesis of Substituted Fluorenes by Cascade Allenylation, Electrocyclization and Intramolecular Friedel-Crafts Reaction of 1,3-Diene-Substituted Propargylic Alcohols
摘要:
A concise, one-step synthesis of substituted fluorenes through TiCl4-promoted cascade allenylation, electrocyclization and intramolecular Friedel-Crafts reaction of 1,3-diene-substituted propargylic alcohols has been developed. An interesting substituent-dependent regioselectivity was observed.
Highly efficient synthesis of polysubstituted fluorene via iron-catalyzed intramolecular Friedel–Crafts alkylation of biaryl alcohols
作者:Soumen Sarkar、Sukhendu Maiti、Krishnendu Bera、Swapnadeep Jalal、Umasish Jana
DOI:10.1016/j.tetlet.2012.08.005
日期:2012.10
An efficient and mild Fe(III)-catalyzed intramolecular Friedel–Crafts alkylation of biaryl methanol derivatives has been developed to achieve the substituted fluorenederivatives. The present reaction provides an excellent alternative to published methods because of its high yields, operational simplicity, mild conditions, and use of inexpensive and sustainable catalyst.
Preparation and reactions of diazo ketones. V. Normal and abnormal products from thermal Wolff rearrangement of 9-phenylfluorene-9-carbonyldiazomethane
作者:Alfred L. Wilds、Richard L. Von Trebra、Neil F. Woolsey