procedure for the synthesis of oxazolidinone and tosyl enamines is reported. Alkynoyl oxazolidinones and tosyl imides undergo reaction to form enamines in the presence of catalytic amounts of tertiaryamines. The data suggest that an amide anion is formed during the reaction, which undergoes conjugate addition to form the final product.
A method for the synthesis of 1,1‐diborylalkenesthrough a Brønstedbasecatalyzedreactionbetweenterminalalkynes and bis(pinacolato)diboron has been developed. The procedure allows direct synthesis of functionalized 1,1‐diborylalkenes from various terminalalkynes including propiolates, propiolamides, and 2‐ethynylazoles.
Asymmetric synthesis of N-stereogenic molecules: diastereoselective double aza-Michael reaction
作者:Alex Lauber、Benjamin Zelenay、Ján Cvengroš
DOI:10.1039/c3cc48486f
日期:——
A novel approach towards the asymmetric synthesis of N-stereogenic molecules via double aza-Michael addition was developed. The diastereomeric ratio can be increased by a thermodynamically controlled isomerization mechanism. Simple separation and functionalization of the products afford N-stereogenic compounds in high enantiomeric purity.