Selective Palladium-Catalyzed Allenic C−H Bond Oxidation for the Synthesis of [3]Dendralenes
作者:Youai Qiu、Daniels Posevins、Jan-E. Bäckvall
DOI:10.1002/anie.201706211
日期:2017.10.9
oxidation was developed, and it provides a novel and straightforward synthesis of [3]dendralene derivatives. A variety of [3]dendralenes with diverse substitution patterns are accessible with good efficiency and high stereoselectivity. The reaction tolerates a broad substrate scope containing various functional groups on the allene moiety, including ketone, aldehyde, ester, and phenyl groups. Also, a wide range
Ruthenium-Catalyzed Flash Oxidation of Allenes to α,α'-Dihydroxyketones
作者:Michael Laux、Norbert Krause
DOI:10.1055/s-1997-5759
日期:1997.7
The ruthenium-catalyzed flash oxidation of β-allenic esters 1 furnishes α,α'-dihydroxyketones 2 in 24-72% yield. In the case of the chiral allene 1e, the oxidation proceeds with good diastereoselectivity (88% de), i.e. with efficient axis to center chirality transfer. The flash oxidation can also be used for the synthesis of corticosteroids, as exemplified by the transformation of allenic steroid 4 into dihydroxyketone 5.
1,6-reduction of 2-en-4-ynoates using lithium di-s-butylcyanocuprete
作者:Norbert Krause、Gabriele Handke
DOI:10.1016/0040-4039(91)80483-m
日期:1991.12
Treatment of 2-en-4-ynoates 1 with lithium di-s-butylcyanocuprate in diethyl ether yields the 1,6-reduction products 2, whereas in tetrahydrofuran the 1,6-addition products 4 are obtained.
1,6-Addition of organolithium compounds to acceptor-substituted enynes catalyzed by a copper(I) arenethiolate
作者:Andreas Haubrich、Mayra van Klaveren、Gerard van Koten、Gabriele Handke、Norbert Krause
DOI:10.1021/jo00073a055
日期:1993.10
KRAUSE, NORBERT, CHEM. BER., 123,(1990) N1, C. 2173-2180