Camphor-based Schiff base ligand SBAIB: an enantioselective catalyst for addition of phenylacetylene to aldehydes
作者:Ramalingam Boobalan、Chinpiao Chen、Gene-Hsian Lee
DOI:10.1039/c1ob06683h
日期:——
series of Schiff base ligands were synthesized from (1R)-camphor. Under the optimal conditions, (+)-SBAIB-a, 10 was found to be an excellent catalyst for the enantioselective addition of phenylacetylene to various aldehydes without utilizing either achiral additives or Ti(OiPr)4. This approach yielded (R)-propargylic alcohols in extremely high yields (up to 99%) and excellent enantioselectivities (up to
从中合成了一系列席夫碱配体 (1 R)-樟脑。在最佳条件下(+)-SBAIB-a,10被发现是用于对映选择性加成的极好的催化剂苯乙炔 无需使用非手性添加剂或 钛(O i Pr)4。该方法以极高的产率(高达99%)和优异的对映选择性(高达92%)产生了(R)-丙炔醇。相应的(S)-丙炔醇的合成具有良好的对映选择性(高达91%)和极好的收率(高达99%),使用(-)-SBAIB-a,41岁。