Rhodium-carbenoid mediated O-H insertion reactions. O-H insertion vs. H-abstraction and effect of catalyst
作者:Geoffrey G. Cox、David J. Miller、Christopher J. Moody、Eric-Robert H.B. Sie、Janusz J. Kulagowski
DOI:10.1016/s0040-4020(01)81117-0
日期:1994.3
The synthesis and rhodium mediated O-H insertion reactions of a wide range of diazo compounds are described. The rate at which the diazo compounds decompose in the presence of 2-propanol and the rhodium catalyst is strongly dependent on the electron withdrawing group(s) attached to the diazo carbon, with diazophosphonates being the least reactive. Insertion into the O-H bond of methanol, t-butanol
描述了多种重氮化合物的合成和铑介导的OH插入反应。重氮化合物在2-丙醇和铑催化剂存在下的分解速率在很大程度上取决于与重氮碳相连的吸电子基团,其中重氮膦酸酯的反应性最低。还研究了将甲醇,叔丁醇和酚插入OH键中,以及催化剂的作用。在某些情况下,重氮基团“还原”为相应的CH 2基团会与OH插入竞争,尽管这在很大程度上取决于催化剂和底物。在使用的催化剂中,三氟乙酰胺铑(II)对于OH插入反应最有效。