I
<sub>2</sub>
/TBHP Mediated Divergent C(sp
<sup>2</sup>
)‐P Cleavage of Allenylphosphine Oxides: Substituent‐Controlled Regioselectivity
作者:Teng Liu、Jie Zhu、Xue Sun、Liang Cheng、Lei Wu
DOI:10.1002/adsc.201900334
日期:2019.8.5
regioselective C(sp2)‐P(O) cleavage of allenylphosphine oxides mediated by I2/TBHP is achieved for the first time. The divergent pathway via cleavage of (Ph)C−P(O) or (allene)C−P(O) modulated by substituents, renders the formation of 4‐iodo‐2‐phenyl‐5H‐1,2‐oxa‐phosphole 2‐oxide and α‐iodoenone derivatives, respectively. A plausible mechanism through radical pathways, along with the cleavage of phenyl and diphenylphosphine
首次实现了由I 2 / TBHP介导的烯丙基膦氧化物的高区域选择性C(sp 2)-P(O)裂解。通过取代基调节的(Ph)C-P(O)或(丙二烯)C-P(O)裂解的发散途径导致形成4-碘-2--2-苯基-5 H -1,2-氧杂-分别是2-氧化物和α-碘烯酮衍生物。捕获实验和18个O同位素标记研究证实了通过自由基途径以及裂解苯基和二苯基膦氧化物部分的合理机制。