Ruthenium catalyst TpRuPPh(3)(CH(3)CN)(2)Cl is found to effect the cyclization of epoxyalkynes to furans in the presence of Et(3)N. The reactions worked well for various epoxyalkynes with suitable oxygen and nitrogen functionalities with low loading of catalyst. It failed with disubstituted epoxyalkynes. The mechanism was elucidated by a deuterium labeling experiment that suggested that the mechanism
发现在Et(3)N存在下,
钌催化剂TpRuPPh(3)(CH(3)CN)(2)Cl影响环氧
炔烃环化成
呋喃。对于具有合适的氧和氮官能度且催化剂负载量低的各种环氧
炔烃,该反应效果很好。用二取代的环氧
炔烃失败。
氘标记实验阐明了该机制,该实验表明该机制涉及
钌-
乙烯基亚砜中间体。