A novel stereoselective synthesis of conjugated dienones
作者:Dawei Ma、Yingrui Lin、Xiyan Lu、Yihua Yu
DOI:10.1016/0040-4039(88)85331-0
日期:1988.1
(E,E)-α,β,-γ,δ-Dienones are synthesized stereoselectively from the corresponding α,β-ynones in high yield under the catalysis of a ruthenium hydride complex.
PARA-QUINOL DERIVATIVES AND METHODS OF STEREO SELECTIVELY SYNTHESIZING AND USING SAME
申请人:Plourde Guy L.
公开号:US20090318548A1
公开(公告)日:2009-12-24
This application relates to para-quinol derivatives, such as analogues of manumycins, aranorosins and gymnastatins. This application also relates to methods of synthesizing and using the para-quinol derivatives. In one embodiment of the invention a compound having the chemical structure (I) is provided wherein X
1
and X
2
are carbon atoms either joined by double bond or joined by a single bond and comprising constituents of an epoxide ring or a hydroxyethylene moiety; X
3
and X
4
are carbon atoms either joined by double bond or joined by a single bond and comprising constituents of an epoxide ring; R
1
is selected from the group consisting of branched alkyl chains, unbranched alkyl chains, cycloalkyl groups, aromatic groups, alcohols, ethers, amines, and substituted or unsubstituted ureas, esters, aldehydes and carboxylic acids; and R
2
is selected from the group consisting of H, OH and NHR
3
wherein R
3
is a nitrogen protecting group. In a particular embodiment of the invention R
1
is a polyunsaturated carbon chain as found in biologically active manumycins. The applicant's synthetic method may involve diasteroselective formation of a spirolactone in an oxidative spiroannulation process using tyrosine or a tyrosine derivative having a chiral centre as a starting material.
OLIGONUCLEOTIDES AND ANALOGS LABELED WITH ENERGY TRANSFER DYES
申请人:Lee Linda G.
公开号:US20100029923A1
公开(公告)日:2010-02-04
Novel linkers for linking a donor dye to an acceptor dye in an energy transfer fluorescent dye are provided. These linkers facilitate the efficient transfer of energy between a donor and acceptor dye in an energy transfer dye. One of these linkers for linking a donor dye to an acceptor dye in an energy transfer fluorescent dye has the general structure R
21
Z
1
C(O)R
22
R
28
where R
21
is a C
1-5
alkyl attached to the donor dye, C(O) is a carbonyl group, Z
1
is either NH, sulfur or oxygen, R
22
is a substituent which includes an alkene, diene, alkyne, a five and six membered ring having at least one unsaturated bond or a fused ring structure which is attached to the carbonyl carbon, and R
28
includes a functional group which attaches the linker to the acceptor dye.
US7825237B2
申请人:——
公开号:US7825237B2
公开(公告)日:2010-11-02
Highly stereoselective isomerization of ynones to conjugated dienones catalyzed by transition-metal complexes