Synthesis of 1,2-phenylenedimethanols by base-promoted reduction of isobenzofuran-1(3H)-ones with silane
作者:Bin Liu、Xigeng Zhou
DOI:10.1016/j.cclet.2018.11.025
日期:2019.3
Abstract An efficient method for preparation of substituted 1,2-phenylenedimethanols and aliphatic 1,4-diols that are valuableintermediates in organic synthesis, has been developed by the base-promoted reduction of isobenzofuran-1(3H)-ones and γ-lactones with silane under mild conditions. Compared with traditional procedures using stoichiometric amounts of metal hydrides and alkyl reductants, the
Domino [Pd]-Catalysis: One-Pot Synthesis of Isobenzofuran-1(3<i>H</i>)-ones
作者:Lodi Mahendar、Gedu Satyanarayana
DOI:10.1021/acs.joc.6b01396
日期:2016.9.2
An efficient domino [Pd]-catalysis for the synthesis of isobenzofuran-1(3H)-ones is presented. The strategy shows broad substrate scope and is amenable to o-bromobenzyl tertiary/secondary/primary alcohols. Significantly, the method was applied to the synthesis of antiplatelet drug n-butyl phthalide and cytotoxic agonist 3a-[4′-methoxylbenzyl]-5,7-dimethoxyphthalide.
Oxidative Kinetic Resolution of Cyclic Benzylic Ethers
作者:Shutao Sun、Yingang Ma、Ziqiang Liu、Lei Liu
DOI:10.1002/anie.202009594
日期:2021.1.4
manganese‐catalyzed oxidative kinetic resolution of cyclic benzylic ethersthrough asymmetric C(sp3)−H oxidation is reported. The practical approach is applicable to a wide range of 1,3‐dihydroisobenzofurans bearing diverse functional groups and substituent patterns at the α position with extremely efficient enantiodiscrimination. The generality of the strategy was further demonstrated by efficient oxidative kinetic
Substituted phthalides, a process for their preparations and pharmaceutical compositions containing them
申请人:——
公开号:US20030220393A1
公开(公告)日:2003-11-27
The invention relates to compounds of formula (I): wherein R
1
represents an alkyl or ureido group, R
2
represents an alkyl group or a hydrogen atom, or R
1
and R
2
together form a 5- or 6-membered ring, R
3
represents a group CN, NO
2
, NR
a
R′
a
, NR
a
SO
2
,R′
a
CZR
5
or CZNR
a
R′
a
, R
4
represents a hydrogen atom or a group R
3
.
1
Redox deracemization of α-substituted 1,3-dihydroisobenzofurans
作者:Xiaohan Chen、Ran Zhao、Ziqiang Liu、Shutao Sun、Yingang Ma、Qingyun Liu、Xia Sun、Lei Liu
DOI:10.1016/j.cclet.2021.02.021
日期:2021.7
However, catalytic asymmetric approaches have been rarely developed. Here, a redox deracemization technology is adopted to address the catalytic asymmetric synthesis. A broad range of α-aryl substituted 1,3-dihydroisobenzofurans are effectively deracemized in high efficiency with excellent ee. α-Alkynyl substituted ethers were also compatible with the deracemization technology.