Chemoselective reduction of aldehydes in the presence of ketones was achieved usingsodium tris(hexafluoroisopropoxy)borohydride which can be stored as a THF solution.
使用可作为 THF 溶液储存的三(六氟异丙氧基)硼氢化钠,在酮的存在下实现醛的化学选择性还原。
Decarboxylative C<sub>sp3</sub>–C<sub>sp3</sub> coupling for benzylation of unstable ketone enolates: synthesis of p-(acylethyl)phenols
A new decarboxylative Csp3-Csp3 coupling approach for the benzylation of ketone enolates has been developed. A variety of raspberry ketone derivatives were conveniently synthesized in good to excellent yields under...
Catalytic hydrogenation of α,β-unsaturated carboxylic acid derivatives using copper(<scp>i</scp>)/N-heterocyclic carbene complexes
作者:Birte M. Zimmermann、Sarah C. K. Kobosil、Johannes F. Teichert
DOI:10.1039/c8cc09853k
日期:——
air-stable copper(I)/N-heterocyclic carbene complex enables the catalytic hydrogenation of enoates and enamides, hitherto unreactive substrates employing homogeneous copper catalysis and H2 as a terminal reducing agent. This atom economic transformation replaces commonly employed hydrosilanes and can also be carried out in an asymmetric fashion.
Ultrafast Time-Resolved Transient Absorption and Resonance Raman Spectroscopy Study of the Photodeprotection and Rearrangement Reactions of <i>p</i>-Hydroxyphenacyl Caged Phosphates
作者:Chensheng Ma、Wai Ming Kwok、Wing Sum Chan、Yong Du、Jovi Tze Wai Kan、Patrick H. Toy、David Lee Phillips
DOI:10.1021/ja0532032
日期:2006.3.1
The kinetics and mechanism of the photodeprotection and rearrangement reactions for the pHP phototrigger compounds p-hydroxyphenacyl diethyl phosphate (HPDP) and diphenyl phosphate (HPPP) were studied using transient absorption (TA) and picosecond time-resolved resonance Raman (ps-TR(3)) spectroscopy. TA spectroscopy was employed to detect the dynamics of the triplet precursor decay as well as to investigate
The synthesis of a new photocaged nicotinamide having an N-acyl carbamate linker and a p-hydroxyphenacyl (pHP) chromophore is described. The photophysical and photochemical studies showed an absorption maximum at λ = 330 nm and a quantum yield for release of 11% that are dependent upon both pH and solvent. While the acyl carbamate releases nicotinamide efficiently, a simpler amide linker was inert