-1,3-Ph 2 -C 3 H 3 )P] (6a, 6d) were obtained. Palladium allyl complexes were screened as precatalysts in the allylicsubstitution of rac-3-acetoxy-1,3-diphenyl-1-propene (I) and (E)-3-acetoxy-1-phenyl-1-propene (III) with dimethyl malonate as the nucleophile. The various catalytic precursors showed a wide range of activity and selectivity. The bismonodentate phosphane complexes 3 are more active than
[RuCl2(κP-η6-phenyl)-P(2-biphenylyl)PhR] complex (9c), where the coordinated phenyl ring belongs to the 2-biphenylyl group. Reaction of P(2-biphenylyl)PhR (R = OMe, Me, i-Pr, and Fc (ferrocenyl)) with Dim2 has given complexes [RuCl2(η6-methyl benzoate)(κP-P(2-biphenylyl)PhR)] (10c–13c). The replacement of methyl benzoate by the phenyl ring of the 2-biphenylyl of the phosphine can be performed at room temperature
对映体纯的P-立体二芳基膦PArPhR(Ar = 9-菲基(a),1-萘基(b)和2-联苯基(c))在β(3 ; R = -CH 2 CH )上具有芳基描述了2(2-萘基))或γ位置(2 ; R = -CH 2 Si(Me 2)CH 2 Ph))。的治疗图2a与将[RuCl 2(η 6 - p -cymene)] 2(DIM1)已导致复杂的合成将[RuCl 2(η 6 - p-cymene)(κ P -图2a)](图4a)。试图用膦的侧基芳基取代对-cymene取代基的尝试失败了。与将[RuCl配体的反应2(η 6 -甲基苯甲酸酯)] 2(DIM2)具有布置络合物将[RuCl 2(η 6 -甲基苯甲酸酯)(κ P - P *)] 6和7(图6a - Ç,P * = 2a – c;7a – b,P *= 3a – b)。的苯甲酸甲酯图6a和6b中已由膦的臂的苯环被成功地替代,得到的复合物将[RuCl
Allylpalladium Complexes with <i>P</i>-Stereogenic Monodentate Phosphines. Application in the Asymmetric Hydrovinylation of Styrene
作者:Arnald Grabulosa、Guillermo Muller、Juan I. Ordinas、Antonio Mezzetti、Miguel Ángel Maestro、Mercè Font-Bardia、Xavier Solans
DOI:10.1021/om050421v
日期:2005.10.1
complexes [PdCl(ally)P*]. The reaction carried out with deuterated styrene shows the clean C−H addition to the vinyl double bond of stryrene and confirms the irreversible nature of the insertion of styrene in the palladium hydride intermediate. The hydrovinylation reaction using substituted styrene with a potentially secondary coordination atom occurs only when the substitution is in the phenyl ring and
一组P-立体异构单齿膦S -PPhRR'(R = 1-萘基,9-菲基或邻-联苯基,R'= CH 3-,i -C 3 H 8-和Ph 3 SiCH 2-)通过在由(-)-麻黄碱和双(N,N-二乙氨基)苯基膦获得的恶杂磷硼烷硼烷上进行连续取代反应,制备了α-己内酰胺。与双核烯丙基化合物[Pd(μ-Cl)(烯丙基)] 2的反应产生中性[PdCl(烯丙基)P *]配合物。当烯丙基= 2-CH 3 -C 3 H 4(5),由于钯原子周围的R-或S-几何形状,溶液中出现了两种异构体。膦的鉴别作用很小,并且对PPh(o -Ph 2)(CH 2 SiPh 3)观察到最大异构体比率。通过X射线衍射确定的两个配合物的分子结构具有P * = PPh(o -Ph 2)(i -Pr)和PPh(o -Ph 2)(OMe),表明烯丙基部分的非对称配位非常相似。磷原子的反式影响更大。当烯丙基= 1-C 6 H 5时-C 3
Designing P-Chirogenic 1,2-Diphosphinobenzenes at Both P-Centers Using P(III)-Phosphinites
作者:Jérôme Bayardon、Yoann Rousselin、Sylvain Jugé
DOI:10.1021/acs.orglett.6b01275
日期:2016.6.17
synthesis of P-chirogenic 1,2-diphosphinobenzenes (DP*B) bearing the chirality on one or both phosphorus centers is reported using aryne chemistry. The principle is based on successive reactions of 1,2-dibromobenzene with sec-phosphide boranes, then DABCO to remove the borane, and finally with chlorophosphines or P(III)-chirogenic phosphinites. The efficiency of this synthesis was demonstrated by the stereoselective