Iridium-Catalyzed, Site-Selective Silylation of Secondary C(sp<sup>3</sup>)–H Bonds in Secondary Alcohols and Ketones
作者:Jake W. Wilson、Bo Su、Makoto Yoritate、Jake X. Shi、John F. Hartwig
DOI:10.1021/jacs.3c03127
日期:2023.9.13
We report the iridium-catalyzed, stereoselective conversion of secondary alcohols or ketones to anti-1,3-diols by the silylation of secondary C–H bonds γ to oxygen and oxidation of the resulting oxasilolane. The silylation of secondary C–H bonds in secondary silyl ethers derived from alcohols or ketones is enabled by a catalyst formed from a simple bisamidine ligand. The silylation occurs with high
Enantioselective microbial hydrolysis of C1 and C2 dissymmetrical cyclic carbonates with disubstitution (methyl and another groups) has been developed. Pseudomonas diminuta (FU0090), a bacterium, efficiently catalyzes the hydrolysis of five-membered cyclic carbonates. While the trans-substrates are hydrolyzed with low enantioselectivities and/or reactivities, the microbe hydrolyzes the cis-substrates