Facile Alder-Ene Reactions of Silylallenes Involving an Allenic C(sp<sup>2</sup>)H Bond
作者:Venkata R. Sabbasani、Genping Huang、Yuanzhi Xia、Daesung Lee
DOI:10.1002/chem.201503243
日期:2015.11.23
involving the activation of an allenic C(sp2)H over an allylic C(sp3)Hbond is described. In this ene reaction, the presence of a silyl substituent was found to be critical for the observed reactivity and selectivity since the corresponding alkyl‐substituted allenes show different reaction profiles. Computational studies show that the origin of this unusualreactivity is the lower bond dissociation
Tetrasubstituted Allene Ethers; Synthesis and Use in Nazarov Reactions
作者:Marcus A. Tius、Bradley K. Tokeshi
DOI:10.1055/s-2004-815994
日期:——
A method for the synthesis of tetrasubstituted allene ethers is described, making use of a reverseBrookrearrangement in the key step. The allene products have been used in the Nazarov cyclization reaction.
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.
Nitration of Silyl Allenes To Form Functionalized Nitroalkenes
作者:Venkata R. Sabbasani、Daesung Lee
DOI:10.1021/ol401735v
日期:2013.8.2
An efficient nitration of silyl allenes with nitrogen dioxide radical, generated from NaNO2 and AcOH, to form alpha-nitro-alpha,beta-unsaturated silyl oximes has been developed. A similar nitration could be achieved by using Fe(NO3)(3)center dot 9H(2)O and FeCl3 center dot 6H(2)O, but different from the regioselective oxime formation, two regioisomeric chloride-trapped products were isolated with varying ratios depending on the steric bulk of the silyl group. A novel ring-closure reaction of alpha-nitro-alpha,beta-unsaturated silyl oximes upon treating with TBAF to form isooxazolidinone derivatives was also developed.