作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/chem.201100305
日期:2011.7.11
2‐iodoallyl alcohols, various substrates that bear a 2‐alkynylallyl alcohol moiety tethered to an additional alkyne were prepared in one step. Subjection to nitrogen acyclic carbene (NAC)/gold(I) catalysts delivered highly substituted phenols in an efficient domino reaction. Furan derivatives were formed as intermediates; this was proven by in situ NMR spectroscopy. The uncommon substitution pattern of
通过将1,7-庚二炔和1,8-辛二炔与2-碘代烯丙基醇进行Sonogashira偶联,一步制备了各种带有2-炔基烯丙基醇部分的底物。服从无环氮卡宾(NAC)/金(I)催化剂可在有效的多米诺反应中释放出高度取代的苯酚。形成呋喃衍生物作为中间体。这已通过原位NMR光谱证明。这些呋喃的罕见取代模式打开该含有羟基的酚类的选择性形成的方式的元 到环结的位置,以前是用金催化的呋喃炔环化无法实现的。此外,衍生自仲烯丙醇的产物获得了有趣的机理见解。在这种情况下,除酚类化合物外,还会通过1,2-烷基转移形成酮。