A carbamoyl anion-initiated cascade reaction with acylsilanes and imines allows rapid construction of substituted [small alpha]-hydroxy-[small beta]-amino amides in high yields with excellent diastereoselectivities.
The asymmetrichydrogenation of silylimines was first developed by using a palladium complex of a P-stereogenic diphosphine ligand as the catalyst, affording the valuable chiral α-aminosilanes with quantitative conversions and excellent enantioselectivities (up to 99% ee).
Divergent synthesis of polysubstituted cyclopropanes and β-silyoxy imidates <i>via</i> switchable additions of <i>N-tert</i>-butanesulfinylimidates to acylsilanes
作者:Fan Tang、Peng-Ju Ma、Yun Yao、Yan-Jun Xu、Chong-Dao Lu
DOI:10.1039/c9cc00963a
日期:——
Products derived from the reaction between N-tert-butanesulfinyl imidates and acylsilanes can be tuned by choosing appropriate bases and solvents. Here we show that in the presence of NaHMDS/THF, addition of enolized N-tert-butanesulfinyl imidates to acylsilanes and subsequent [1,2]-Brook rearrangement generate β-silyloxy anion intermediates that undergo intramolecular cyclization to afford polysubstituted
Functionalized Cyclopentenes via the Formal [4+1] Cycloaddition of Photogenerated Siloxycarbenes from Acyl Silanes
作者:João R. Vale、Rafael F. Gomes、Carlos A. M. Afonso、Nuno R. Candeias
DOI:10.1021/acs.joc.2c00591
日期:2022.7.15
cycloaddition reaction of photogenerated nucleophilic carbenes derived from acylsilanes with electrophilic dienes. The resulting transient donor–acceptor cyclopropane rearranges to its stable and highly functionalized cyclopentene isomer in an unprecedented metal-free process. The cyclopropanation–vinyl cyclopropane rearrangement sequence was corroborated by computational calculations. The cyclopropane formation
Nucleophilic Allylation of Acylsilanes in Water: An Effective Alternative to Functionalized Tertiary α-Silylalcohols
作者:Xiu-Xia Liang、Chen Zhu、Wang Zhang、Ya-Nan Du、Lei Xu、Lihua Liu、Yicheng Zhang、Man-Yi Han
DOI:10.1021/acs.joc.3c00668
日期:2023.8.18
nucleophilic allylation of acylsilanes in water was developed, generating versatile functionalized tertiary α-silyl alcohols in high yields. With the assistance of hydrogen bonding, a reaction model of less reactive acylsilane was achieved. Unlike the conventional strategy, transition metals and an additional Lewis acid catalyst were not required, and rate acceleration was observed in water.