Kinetic Resolution and Double Stereodifferentiation in Catalytic Asymmetric C−H Activation of 2-Substituted Pyrrolidines
摘要:
Dirhodium tetrakis (S-(N-dodecylbenzenesulfonyl)prolinate (Rh-2(S-DOSP)(4)) catalyzed decomposition of methyl aryldiazoacetates in the presence of a substituted pyrrolidines results in highly diastereoselective and enantioselective C-H insertions, These reactions can proceed with impressive levels of double stereodifferentiation and kinetic resolution, which allows for three stereocenters to be controlled during the C-H insertion step.
New Strategic Reactions for Organic Synthesis: Catalytic Asymmetric C−H Activation α to Nitrogen as a Surrogate for the Mannich Reaction
作者:Huw M. L. Davies、Chandrasekar Venkataramani、Tore Hansen、Darrin W. Hopper
DOI:10.1021/ja0290072
日期:2003.5.1
activation reactions of methyl aryldiazoacetates are readily induced by the rhodium prolinate catalyst Rh(2)(S-DOSP)(4) (1) or the bridged prolinate catalysts Rh(2)(S-biDOSP)(2) (2a) and Rh(2)(S-biTISP)(2) (2b). The C-H activation of N-Boc-protected cyclic amines demonstrates that the donor/acceptor-substituted carbenoids display remarkable chemoselectivity, which allows for highly regioselective,
One-Pot Bi(OTf)3-Catalyzed Oxidative Deprotection of tert-Butyldimethyl Silyl Ethers with TEMPO and Co-Oxidants
作者:Jean-Michel Vatèle、Bogdan Barnych
DOI:10.1055/s-0030-1260980
日期:2011.9
A sequential one-pot synthesis for the oxidation of primary and secondary tert-butyldimethylsilyl (TBDMS) ethers, using catalytic amounts of metal triflates and TEMPO in combination with PhIO or PhI(OAc)2 in THF or acetonitrile, is described. Acid-sensitive protecting groups such as methylidene, isopropylidene, acetals, and Boc are unaffected under the reaction conditions. Another feature of this procedure
Kinetic Resolution and Double Stereodifferentiation in Catalytic Asymmetric C−H Activation of 2-Substituted Pyrrolidines
作者:Huw M. L. Davies、Chandrasekar Venkataramani
DOI:10.1021/ol015974q
日期:2001.5.1
Dirhodium tetrakis (S-(N-dodecylbenzenesulfonyl)prolinate (Rh-2(S-DOSP)(4)) catalyzed decomposition of methyl aryldiazoacetates in the presence of a substituted pyrrolidines results in highly diastereoselective and enantioselective C-H insertions, These reactions can proceed with impressive levels of double stereodifferentiation and kinetic resolution, which allows for three stereocenters to be controlled during the C-H insertion step.