Synthesis and <i>C</i>-Alkylation of Hindered Aldehyde Enamines
作者:David M. Hodgson、Christopher D. Bray、Nicholas D. Kindon、Nigel J. Reynolds、Steven J. Coote、Joann M. Um、K. N. Houk
DOI:10.1021/jo802016t
日期:2009.2.6
hindered lithium amides with terminal epoxides is described whereby aldehydeenamines are produced via a previously unrecognized reaction pathway. Some of these aldehydeenamines display unprecedented C-alkylation reactivity toward unactivated primary and secondary alkyl halides. For comparison, the reactivity of aldehydeenamines synthesized via a traditional condensation method was examined. C- rather
Catalytic C–H Arylation of Aliphatic Aldehydes Enabled by a Transient Ligand
作者:Ke Yang、Qun Li、Yongbing Liu、Guigen Li、Haibo Ge
DOI:10.1021/jacs.6b08478
日期:2016.10.5
The direct arylation of aliphaticaldehydes has been established via Pd-catalyzed sp3 C-H bond functionalization in the presence of 3-aminopropanoic acids as transient directing groups. The reaction showed excellent functional group compatibility and chemoselectivity in which a predominant preference for functionalizing unactivated β-C-H bonds of methyl groups over others was achieved. In addition
Fluoride-Promoted Rearrangement of Organo Silicon Compounds: A New Synthesis of 2-(Arylmethyl)aldehydes from 1-Alkynes
作者:Laura Antonella Aronica、Patrizio Raffa、Anna Maria Caporusso、Piero Salvadori
DOI:10.1021/jo0351062
日期:2003.11.1
A new approach to 2-(arylmethyl)aldehydes 4 based upon a 1,2-anionotropic rearrangement of an aryl group is presented. The synthetic sequence begins with a silylformylation reaction of terminal acetylenes 5 with aryl and heteroaryl silanes 6, followed by treatment of the products (Z)-1 with TBAF. The optimization of the experimental conditions of the fluoride-promoted step is described, together with
New synthesis of α-benzylaldehydes from 2-(dimethylphenylsilylmethylene)alkanals by fluoride promoted phenyl migration
作者:Laura Antonella Aronica、Francesca Morini、Anna Maria Caporusso、Piero Salvadori
DOI:10.1016/s0040-4039(02)01178-4
日期:2002.8
α-Benzyl aldehydes are prepared from easily available β-silylalkenals and fluoride reagents, under mild experimental conditions; the reaction occurs instantaneously with almost quantitative yields. A plausible mechanism is suggested, which involves a 1,2-phenylmigrationfrom the silicon to the adjacent carbon atom.
This invention provides fragrance compositions comprising a carrier solution used for cleaning purposes or for topical administration and nonfragrant photoresponsive agents that are capable of undergoing intramolecular photorearrangements to release a fragrance. The photoresponsive fragrance composition may comprise the prephotorearrangement first fragrance agent, the photorearranged and released fragrance agent, a combination of the first and second agents, or any of the above in combination with a known fragrance agent.