Microwave-Enhanced Rhodium-Catalyzed [2+2+2] Cycloaddition Reactions To Afford Highly Functionalized Pyridines and Bipyridines
作者:Lídia Garcia、Anna Pla-Quintana、Anna Roglans、Teodor Parella
DOI:10.1002/ejoc.200901318
日期:——
Rhodium(I)-catalyzed [2+2+2] cycloaddition reactions of N-tosyl-, carbon-, and oxygen-tethered cyanodiynes in a completely intramolecular fashion have been optimized to afford highly functionalized pyridines by conventional and/or microwave heating. Microwaves have been shown to enhance the process by allowing the reaction to be conducted effectively in short reaction times. The methodology has been
铑 (I) 催化的 N-甲苯磺酰基-、碳-和氧-束缚的氰基二炔以完全分子内方式的 [2+2+2] 环加成反应已被优化以通过常规和/或微波加热提供高度官能化的吡啶。微波已被证明可以通过在较短的反应时间内有效地进行反应来增强该过程。该方法已扩展用于合成联吡啶,通过用附加的吡啶处理氰基二炔或在二氰基四炔支架上进行双 [2+2+2] 环加成反应。微波加热反应中溶剂的选择已被证明是该过程成功的关键。