A New Class of 3′-Sulfonyl BINAPHOS Ligands: Modulation of Activity and Selectivity in Asymmetric Palladium-Catalysed Hydrophosphorylation of Styrene
作者:Katalin Barta、Giancarlo Franciò、Walter Leitner、Guy C. Lloyd-Jones、Ian R. Shepperson
DOI:10.1002/adsc.200800366
日期:2008.9.5
(R)-8a–j with (S)-1,1′-binaphthalene-2,2′-dioxychlorophosphine (S)-9 generates 3′-sulfonyl BINAPHOS ligands (R,S)-10a–j in good yields (43–82%). These new ligands are of utlility in the asymmetric hydrophosphonylation of styrene (1) by 4,4,5,5-tetramethyl-1,3,2-dioxaphospholane 2-oxide (2), for which a combination of the chiral ligands with either [Pd(Cp)(allyl)] or [Pd(allyl)(MeCN)2]+/NaCH(CO2Me)2 proves
BINOL(R F = CF 3或C 4 F 9)的BINOL (R)-2,2'-双全氟烷磺酸的钯催化的单芳基次膦酸酯[Ar 2 P(O)H]的单磷酸化反应,然后还原氧化膦(Cl 3然后用二异丙基氨基锂介导的阴离子硫杂-弗里斯重排提供对映体纯的(R)-2'-二芳基膦基2'-羟基3'-全氟烷磺酰基-1,1'-联萘[[ R)-8ab和(R)-8g –j ],可通过格氏试剂(RMgX)介导的CF 3-置换[ (R)-8c–f ]。(耦合ř) - 8A-J与(小号)-1,1'-联二萘-2,2'-二dioxychlorophosphine(小号) - 9生成3'-磺酰BINAPHOS配体([R ,小号) - 10A-J中良好收率(43–82%)。这些新的配体在将苯乙烯(1)通过4,4,5,5-四甲基-1,3,2-二氧杂膦环氧化物2-氧化物(2)进行不对称氢膦酰化反应中具有实用性,为此手性配体与[Pd