Palladium complexes of phosphinamine ligands in the intramolecular asymmetric Heck reaction
作者:Denis Kiely、Patrick J Guiry
DOI:10.1016/j.jorganchem.2003.09.045
日期:2003.12
The synthesis of two novel cyclisation substrates for the asymmetric intramolecular Heck reaction is reported. Their cyclisation, in addition to a known substrate for cis-decalin formation, were tested with palladium complexes of BINAP and heterobidentate oxazoline-containing ligands. In general BINAP provides a more active catalyst system for the range of substrates tested although excellent enantioselectivities
报道了用于不对称分子内Heck反应的两种新型环化底物的合成。除已知的顺式十氢萘形成底物外,它们的环化反应还使用了BINAP钯配合物和含杂双恶唑啉的配体进行了测试。通常,尽管使用研究的P,N配体可获得高达85%的出色对映选择性,但BINAP可以为所测试的各种底物提供更具活性的催化剂体系。注意到趋势,其中叔亮氨酸衍生的恶唑啉配体比缬氨酸衍生的类似物更具反应性和对映选择性。类似地,二苯基膦基二茂铁基二恶唑啉配体比相应的二苯基膦基苯基恶唑啉配体更具反应性和选择性。