Synthesis of (E)-α,β-unsaturated carboxylic esters derivatives from cyanoacetic acid via promiscuous enzyme-promoted cascade esterification/Knoevenagel reaction
lipase-catalyzed cascade toward (E)-α,β-unsaturatedcarboxylic esters is presented. The proposed methodology consists of elementary organic processes starting from acetals and cyanoacetic acid leading to the formation of desired products in a cascade sequence. The combination of enzyme promiscuous abilities gives a new opportunity to synthesize complex molecules in the one-pot procedure. Results of studies
α-hydroxymethyl radicals can be generated from α-silyl ethers by irradiation in the presence of 9,10-anthracenedicarbonitrile (ADC) and biphenyl (BP). Under these conditions the hydroxymethyl radicals are not oxidized further but add directly to electron-poor alkenes [Eq. (a); EWG=electron-withdrawing group]. The radical adduct undergoes back electrontransfer to form the carbanion, which is protonated
The control of diastereoselectivity in the Michael reaction of ketonic enolates with crotonic acid derivatives
作者:E.J. Corey、Ioannis N. Houpis
DOI:10.1016/s0040-4039(00)60431-8
日期:1993.4
Methodology is described for the selective generation of either anti or syn Michael adducts from various ketone enolates and crotonic ester 18 or amide 15.
An efficient synthesis of 3-acylcarbazoles and observations on the further elaboration of these compounds to 6h-pyridocarbazoles
作者:Iain Hogan、Paul Jenkins、Malcolm Sainsbury
DOI:10.1016/s0040-4039(00)82385-0
日期:1988.1
A new procedure for the synthesis of 3-acylcarbazoles useful for the construction of 6H-pyrido[4,3-b]carbazoles is described starting from readily available gramines, or indoles. This methodology is exemplified by a synthesis of the anticancer alkaloid olivacine. Some discrepancies are noted between our results and those of other authors.
This invention concerns HIV replication inhibitors of formula
the N-oxides, the pharmaceutically acceptable addition salts, the quaternary amines and the stereochemically isomeric forms thereof; their use as a medicine, their processes for preparation and pharmaceutical compositions comprising them.