Chiral terpene auxiliaries II. Spiroborate esters derived from α-pinene—new catalysts for asymmetric borane reduction of prochiral ketones
作者:Marek P. Krzemiński、Marta Ćwiklińska
DOI:10.1016/j.tetlet.2011.05.095
日期:2011.7
New spiroborate esters derived from (1R,2R,3S,5R)-3-aminopinan-2-ol and ethylene glycol, propane-1,3-diol, pinacol, catechol, (1S,2S,3R,5S)-pinane-2,3-diol, and (1R,2R,3S,5R)-pinane-2,3-diol were used as catalysts in the borane reduction of acetophenone and other prochiral aryl alkyl ketones producing the corresponding alcohols in high yields. The influence of the spiroborate structure on the enantioselectivity
由(1 R,2 R,3 S,5 R)-3-氨基pinan-2-ol和乙二醇,1,3-丙二醇,频哪醇,邻苯二酚,(1 S,2 S,3 R,5 S)-pin烷-2,3-二醇和(1 R,2 R,3 S,5 R)-pin烷-2,3-二醇被用作苯乙酮和其他前手性芳基的硼烷还原催化剂烷基酮以高收率生产相应的醇。研究了螺硼酸酯结构对产物醇的对映选择性和构型的影响。