RUTHENIUM-DIAMINE COMPLEX AND METHOD FOR PRODUCING OPTICALLY ACTIVE COMPOUND
申请人:Touge Taichiro
公开号:US20140051871A1
公开(公告)日:2014-02-20
Provided is a ruthenium complex that is represented by general formula (1*) and is useful as an asymmetric reduction catalyst.
(In the formula, * is an asymmetric carbon atom; R
1
is an arenesulfonyl group, and the like; R
2
and R
3
are a phenyl group, and the like; R
10
through R
14
are selected from a hydrogen atom, C
1-10
alkyl group, and the like, but R
10
through R
14
are not simultaneously hydrogen atoms; X is a halogen atom and the like; j and k are each either 0 or 1; and j+k is 0 or 2.)
Newly developed oxo-tethered Ru amido complexes (R,R)-1 and their HCl adducts (R,R)-2 exhibited excellent catalytic performance for both asymmetric transfer hydrogenation and the hydrogenation of ketonic substrates under neutral conditions without any cocatalysts to give chiral secondary alcohols with high levels of enantioselectivity.
Kinetic Resolution of 1,2-Diols via NHC-Catalyzed Site-Selective Esterification
作者:Bin Liu、Jiekuan Yan、Ruoyan Huang、Weihong Wang、Zhichao Jin、Giuseppe Zanoni、Pengcheng Zheng、Song Yang、Yonggui Robin Chi
DOI:10.1021/acs.orglett.8b01029
日期:2018.6.15
A kinetic resolution of 1,2-diols bearing both a secondary and a primary alcohol motif through an N-heterocyclic carbene-catalyzed oxidativeacylation reaction has been developed. A site- and enantioselective esterification reaction is involved for this process. Both the monoacylated diols obtained and the remaining enantioenriched 1,2-diols are versatile building blocks for the preparation of functional
4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxamides as antiviral agents
申请人:Schnute Edward Mark
公开号:US20050004161A1
公开(公告)日:2005-01-06
The invention provides a compound of formula I:
wherein A, B, R
1
, R
2
, R
3
, and R
4
are as defined in the specification. The compounds of the present invention are useful for treating viral infections, in particular a herpesviral infection.
Enantioselective Synthesis of the AB-Ring System of the Antitumor Antibiotic Tetrazomine
作者:Peter Wipf、Corey R. Hopkins
DOI:10.1021/jo015512q
日期:2001.5.1
4-tetrahydroisoquinoline moiety of tetrazomine was accomplished in 18 steps and in 3% overall yield from commercially available o-anisaldehyde. The reaction sequence utilizes a Sharpless asymmetric dihydroxylation to install the stereocenter and an intramolecular Friedel--Crafts hydroxyalkylation with an N-protected 2-oxo-acetamide to close the heterocyclic ring.