作者:M.Rute G da Costa、M.João M Curto、Stephen G Davies、M.Teresa Duarte、C Resende、Fátima C Teixeira
DOI:10.1016/s0022-328x(00)00215-1
日期:2000.6
at N(2) and C(3), to afford [η6-1-bis(trimethylsilyl)methylindazole]tricarbonylchromium (14) and [η6-2-bis(trimethylsilyl)methyl-3-trimethylsilylindazole]tricarbonylchromium (15), respectively. The deprotonation of complex 14 followed by electrophilic quench occurs at the C(4) and C(7) positions in a ratio of 3:1 and with complex 15 the deprotonation was completely regioselective at the C(7) position
吲唑铬配合物和它的一些衍生物的是由两种策略来合成:(1)通过环化[η 6 -2-(2'-苯基肼)-1,3-二氧戊环] tricarbonylchromium(2在酸性条件下),将其转换成σ-复数(11); (2)通过在N(1)处使用大体积保护基,将Cr(CO)6与1-双(三甲基甲硅烷基)甲基吲唑(3)和2-双(三甲基甲硅烷基)甲基-3-三甲基甲硅烷基吲唑(4)热解,在N(2)和C(3)同时,得到[η 6 -1-双(三甲硅烷基)甲基吲唑] tricarbonylchromium(14)和[η 6 -2双(三甲硅烷基)甲基-3- trimethylsilylindazole] tricarbonylchromium(15)。在C(4)和C(7)位置以3:1的比例发生复合物14的去质子化,然后进行亲电淬灭;对于复合物15,去质子化在C(7)位置上具有完全的区域选择性。此取代基的位置是由NOE差光谱和X射线晶体结构测定证实了[η