Aluminium trichloride catalyses the expeditious direct conversion of tetrahydropyranylethers to silyl ethers. This one-step transformation is chemoselective versus deprotection of the acetal and hydrosilylation of unsaturated carbon–carbon bonds, and can also be applied to linear acetals. A possible mechanism is tentatively proposed.
catalytic amount of iron(II) triflate, TIPS-protected peroxides bearing primary, secondary, and tertiary C-H sites undergo chemoselective thioetherification of remote C-H bonds with diaryl disulfides. The reaction demonstrates a broad substrate scope and functional group tolerance without the use of any noble metal additives. Mechanistic experiments suggest that the reaction proceeds through 1,5-H atom
Rhodium‐Catalyzed Remote C(sp
<sup>3</sup>
)−H Borylation of Silyl Enol Ethers
作者:Jie Li、Shuanglin Qu、Wanxiang Zhao
DOI:10.1002/anie.201913281
日期:2020.2.3
rhodium-catalyzed remote C(sp3 )-H borylation of silylenolethers (SEEs, E/Z mixtures) by alkene isomerization and hydroboration is reported. The reaction exhibits mild reaction conditions and excellent functional-group tolerance. This method is compatible with an array of SEEs, including linear and branched SEEs derivedfrom aldehydes and ketones, and provides direct access to a broad range of structurally
The total synthesis of a series of new carolacton derivatives that mainly lack selected methyl substituents along the polyketide backbone is reported. Their inhibitory activity towards bacterial biofilms revealed that selective removal of the methyl group at C10 does not have a major effect on biological activity, whereas additional removal of the methyl group at C14 in carolacton results in a large