Silver-catalyzed decarboxylative C(sp<sup>2</sup>)–C(sp<sup>3</sup>) coupling reactions <i>via</i> a radical mechanism
作者:Zhongxue Fang、Chenlong Wei、Jing Lin、Zhenhua Liu、Wei Wang、Chenshu Xu、Xuemin Wang、Yu Wang
DOI:10.1039/c7ob02455j
日期:——
A silver catalyzed decarboxylative C(sp2)–C(sp3) coupling of vinylic carboxylic acids with alcohols, alkylbenzenes, cycloalkanes and cyclic ethers was developed by using DTBP as an oxidant. This reaction tolerates a wide range of substrates, and products are obtained in good to excellent yields. The reaction also shows good stereoselectivity, and only trans-isomers are obtained. In addition, a radical
Previously, we reported a click-chemistry based approach to the synthesis of a novel class of histonedeacetylase (HDAC) inhibitors [1]. The lead compound NSC746457 was found to be as potent as SAHA (Vorinostat). Further optimization of NSC746457 by using the HDAC2-TSA crystal structure is described herein. Docking of NSC746457 into HDAC2 binding domain suggested that the hydrophobic residue Phe210 flanking
Molybdenum-Catalyzed Diastereoselective <i>anti</i>-Dihydroxylation of Secondary Allylic Alcohols
作者:Shixia Su、Chuan Wang
DOI:10.1021/acs.orglett.9b00735
日期:2019.4.5
In this protocol, we report a Mo-catalyzed anti-dihydroxylation of secondary allylic alcohols, providing a general method for the preparation of 1,2,3-triols bearing up to three continuous stereocenters with excellent diastereocontrol. The mechanistic studies reveal that this dihydroxylation reaction consists of two steps and up to excellent diastereomeric ratios of the final triol products can be
Chemoenzymatic total synthesis of the phytotoxic lactone herbarumin III
作者:Samik Nanda
DOI:10.1016/j.tetlet.2005.03.139
日期:2005.5
Asymmetric totalsynthesis of phytotoxic nonenolide herbarumin III was accomplished by a chemoenzymatic approach. The main highlight of the synthesis was to fix the hydroxyl stereocenters (C7 and C9) by lipase catalyzed irreversible transesterification.
A polyphenylene ether resin composition containing the following Components (A) to (D) according at the following formulation ratio.
(A) 50 to 99.5 parts by weight of a polyphenylene ether
(B) 0.1 to 50 parts by weight of a partially hydrogenated aromatic alkenyl compound-conjugated diene block copolymer having a hydroxy group
and based on 100 parts by weight of the above resin composition,
(C) 0 to 950 parts by weight of a thermoplastic resin
and
(D) 0 to 10 parts by weight of a phosphorous acid triester