“Chirality transfer” in iron-mediated dienylic substitutions via highly enantiomerically enriched planar chiral 1-phenylsulfonyl-substituted tricarbonyl(η5-pentadienyl) iron(1 +) complexes
作者:Dieter Enders、Bernd Jandeleit、Stefan von Berg
DOI:10.1016/s0022-328x(96)06850-7
日期:1997.4
neutral tricarbonyl(η4-diene)iron(0) complexes 6 [(1 R,5S)-6 ψ-endo-6 and (1 S,5S)-6 ψ-exo-6; de > 99%, ee > 99%; 85% quant. prior to resolution]. The nucleophilic addition of hetero and carbon atom nucleophiles (morpholine, silyl enol ether 8 and silyl ketene acetal 9) to the racemic complex syn,syn-(1R/S, 5 R/S)-7 afforded the neutral ε-substituted tricarbonyl(η4-diene)iron(0) complexes rac-ψ-exo-10ac
的制备高度diastereo-和对映体富集的手性平面1-苯磺酰基取代的三羰基(η 5 -戊二烯基)铁(1 +)络合物7 [顺式,顺式- (1- [R,5 - [R )- 7和SYN,SYN - ( 1 S,5 S)-7(顺式或U形); DE > 99%5-顺式-CH 3 / 5-抗-CH 3 ⪢100:1,EE> 99%; 数量的87%描述了来自解析的6 ]。从对映纯二烯(1ë,3 E,S) - 5的阳离子络合物的两种对映体顺式,顺式- 7成为通过相应的中性三羰基的非对映混合物的色谱拆分容易获得(η 4 -二烯)合铁(0)配合物6 [(1- [R,5小号) - 6 ψ-内切- 6和(1级小号,5小号) - 6 ψ-外型- 6 ; de > 99%,ee> 99%;定量的85%解决之前]。杂原子和碳原子亲核试剂(吗啉,甲硅烷基烯醇醚8和甲硅烷基烯酮缩醛9)的亲核加成到外消旋复合物syn,syn-(1