Synthesen von ?-substituierten ?-Nitrocarbons�ureestern aus ?-Nitrocycloalkanonen
摘要:
Synthesis of ω‐Nitroalkanoates Substituted in ω‐Position from α‐Nitrocycloalkanonesα‐Nitrocycloalkanones substituted in α‐position by a functionalized alkyl residue underwent ring opening to the corresponding chain derivatives by intermolecular nucleophilic attack; ω‐nitroalkanoates substituted in ω‐position were obtained (Scheme 1). The so formed methyl 6‐nitro‐9‐oxodecanoate (3) was used to prepare methyl 8‐(2‐methyl‐1,3‐dioxolan‐2‐yl)octanoate (15), an intermediate in the synthesis of the sex phermone of the honey bee.
Michael Additions in Aqueous Media: “On-Water” and “In-Water” Processes from α-Nitro Ketones and Their Anions
作者:Giorgio Giorgi、Pilar López-Alvarado、Sonia Miranda、Jean Rodriguez、J. Carlos Menéndez
DOI:10.1002/ejoc.201201431
日期:2013.3
A variety of α,β-unsaturatedaldehydes and ketones gave very high-yielding Michael addition reactions with α-nitrocycloalkanones in water, at room temperature without added catalyst. These can be considered as one of the very few “on-water” Michael reactions known in the literature, because they took place in suspension or emulsion and at increased speed relative to the same transformations performed
The Carbon Zip Reaction: A Method for Expanding Carbocycles
作者:Yoshihiko Nakashita、Manfred Hesse
DOI:10.1002/hlca.19830660318
日期:1983.5.5
A general method for enlargement of carbocyclic rings by the so called zipreaction is given. The Michael adducts of 2-nitrocycloalkanones with 3-oxo-4-pentenoates in the presence of tetrabutylammonium fluoride give in high yield compounds with the ring enlarged by four C-atoms. By this method 7-, 8-, and 12-membered cycloalkanones were converted respectively to 11-, 12-, and 16-membered functionalized
作者:Tetsuya Aono、Jost H. Bieri、Manfred Hesse、Kalina Kostova、Annalaura Lorenzi-Riatsch、Yoshihiko Nakashita、Roland Prewo
DOI:10.1002/hlca.19850680429
日期:1985.6.26
11-dioxocycloundecanecarboxylate (24), methyl 5-nitro-2,12-dioxocyclododecanecarboxylate (21), and 8-nitro-11-oxo-13-tridecanolide (7), which are intermediates, side products, or end products of the ‘Zip’ ring-enlargementreaction. The conformations of most of the medium-ring compounds are very similar to equal-sized ring compounds previously determine by other authors.