Chiral Phosphane Alkenes (PALs): Simple Synthesis, Applications in Catalysis, and Functional Hemilability
作者:Elisabetta Piras、Florian Läng、Heinz Rüegger、Daniel Stein、Michael Wörle、Hansjörg Grützmacher
DOI:10.1002/chem.200501470
日期:2006.7.24
Catalysts prepared from [Rh(2)(mu(2)-Cl)(2)(C(2)H(4))(4)] and (S)-4 have allowed the efficient enantioselective 1,4-addition of arylboronic acids to alpha,beta-unsaturated carbonyls (Hayashi-Miyaura reaction) (5-0.1 mol % catalyst, up to 95% ee). The iridium complex (S,S)-[Ir((Ph)tropp(Ph))(2)]OTf ((S,S)-6; OTf=SO(3)CF(3)) has been used as a catalyst in the hydrogenation of various nonfunctionalized
手性膦烷(PAL)的简单合成包括:1)钯催化的10-溴-5H-二苯并[a,d]环庚烯-5-醇(1)与苯基硼酸的铃木偶联,定量得到10-苯基-5H-二苯并[a,d]环庚-5-醇(2);2)2在酸性条件下与Ph(2)PCl反应,得到膦氧化物(10-苯基-5H-二苯并[a,d]环庚烯基5-基)二苯基膦氧化物((Ph)troppo( Ph),3),通过在手性柱上使用高压液相色谱(HPLC)分离成对映异构体;3)用三氯硅烷还原,得到对映体纯的膦(R)-和(S)-(10-苯基-5H-二苯并[a,d]环庚-5-基)二苯基膦((Ph)tropp(Ph),4 )。这种高度刚性的凹形配体在Rh(I)和Ir(I)络合物中充当双齿配体。由[Rh(2)(mu(2)-Cl)(2)(C(2)H(4))(4)]和(S)-4制备的催化剂可实现芳基硼酸转化为α,β-不饱和羰基(Hayashi-Miyaura反应)(5-0.1