Free radical reactions for heterocycle synthesis. Part 5: Formation of novel bridged spirolactones by double cyclizations
摘要:
Novel bridged spirolactones have been synthesized via double radical cyclization of enol ester radicals. (C) 2001 Elsevier Science Ltd. All rights reserved.
Free radical reactions for heterocycle synthesis. Part 5: Formation of novel bridged spirolactones by double cyclizations
摘要:
Novel bridged spirolactones have been synthesized via double radical cyclization of enol ester radicals. (C) 2001 Elsevier Science Ltd. All rights reserved.
Free radical reactions for heterocycle synthesis. Part 7: 2-Bromobenzoic acids as building blocks in the construction of spirobenzolactones and spirobenzolactams
作者:Wei Zhang、Georgia Pugh
DOI:10.1016/s0040-4020(03)00655-0
日期:2003.6
A straightforward 2-step parallel synthesis for structurally diversified spiro compounds is developed. 2-Bromobenzoic acids are used as common building blocks to couple with a series of conjugated enoles or enamines. Sequential intramolecular free radical Michael additions lead to formation of spirobenzolactones, spirobenzolactams, spirobenzolactone-lactams, spiorbenzolactone-thiolactones, spiordilactones