The influence of hydrogen bonding on the solvolytic reactivity of nicotinates in fluorinated alcohols
作者:Branko Juršić、Dionis E. Sunko、Mladen Ladika
DOI:10.1016/s0040-4020(01)90312-6
日期:1987.1
A systematic investigation of solvolyticreactivities of allylic and benzylic nicotinates and their N-methylated derivatives in 80% EtOH, 97% TFE and 97% HFIP was undertaken. The nicotinates in 97% HFIP are slightly more reactive than the corresponding p-nitrobenzoates, whereas the ratio of these reactivities is inverse in 80% EtOH and 97% TFE. This observation was explained by the stronger hydrogen
Cyclization of 1,3-disubstituted 2-(3-butenyl)-2-cyclohexen-1-ols
作者:E.-J. Brunke、F.-J. Hammerschmidt、H. Struwe
DOI:10.1016/s0040-4020(01)97681-1
日期:1981.1
The cationic cyclization of cyclohexenols 8a-c gave mixtures of the octalinols 9a-c and 10a-c with 9a-c as main products. By cyclization of the isomeric educts 13a-c, the same products were formed in different proportions.
3-Methylcyclohex-2-enone derivatives as initiators of cyclisation. Part 1. Introduction and synthesis of 2-substituted 3-methylcyclohex-2-enones
作者:Joseph A. Amupitan、Enamul Huq、Michael Mellor、Edward G. Scovell、James K. Sutherland
DOI:10.1039/p19830000747
日期:——
A series of C-2 substituted 3-methylcyclohex-2-enones has been prepared using the Hagemann ester route. A new synthesis of these compounds has been developed which involves the alkylation of the N,N-diethylaminoethyl ether of 1-hydroxy-5-methylcyclohexa-1,5-diene. The cyclohexenones have been converted into the corresponding α,β-epoxyketones using alkaline hydrogen peroxide.
Stereocontrol in a Combined Allylic Azide Rearrangement and Intramolecular Schmidt Reaction
作者:Ruzhang Liu、Osvaldo Gutierrez、Dean J. Tantillo、Jeffrey Aubé
DOI:10.1021/ja300369c
日期:2012.4.18
Pre-equilibration of an interconverting set of isomeric allylicazides is coupled with an intramolecular Schmidt reaction to afford substituted lactams stereoselectively. The effect of substitution and a preliminary mechanistic study are reported. The synthetic potential of this method is demonstrated in the context of an enantioselective synthesis of an advanced intermediate leading toward pinnaic
TMSOTf, triggering the cationic 6-endo-trig cyclization, and closes after C−C bond formation and diastereoselective protonation to terminate the process. DFT calculations confirm this mechanistic proposal and provide a rationale for the observed diastereoselectivity. The reaction tolerates a wide range of functionalities and nucleophilic partners within the substrate. We have also shown that the one-pot