[(η5-C5Me5)M(PP*)(H2O)][SbF6]2 (M = Rh, Ir; PP* = chiral diphosphane) have been tested as catalysts for the asymmetric 1,3-dipolar cycloaddition of nitrones to α,β-unsaturated aldehydes. Quantitative conversions with very high regioselectivity, perfect endo selectivity and excellent enantioselectivity (up to 99% ee) were achieved. The stereochemical outcome was analyzed on the basis of the stereoelectronic properties
所述
水性络合物[(η 5 -C 5我5)M(PP *)(H 2 O)] [的SbF 6 ] 2(M =
铑,
铱; PP * =手性
二膦)已测试作为催化剂用于不对称硝酮的1,3-偶极环加成反应生成α,β-不饱和醛。具有很高的区域选择性,完美的内在选择性和出色的对映选择性(高达99%ee)的定量转化。的立体
化学结果进行分析式[(η的中间烯醛复合物的立体电子性质的基础上,5 -C 5我5)M(PP *)(烯醛)] [的SbF 6 ] 2。