The first catalytic inverse-electron demand hetero-Diels–Alder reaction of nitroso alkenes using pyrrolidine as an organocatalyst
作者:Tobias C. Wabnitz、Steen Saaby、Karl Anker Jørgensen
DOI:10.1039/b316518c
日期:——
The first catalytic inverse-electron demand hetero-Diels-Alderreaction of nitroso alkenes has been developed. Nitroso alkenes were generated in situ from alpha-halooximes and underwent [4 + 2]-cycloadditions with enamines as dienophiles formed from aldehydes and pyrrolidine (10 mol%) as an organocatalyst. The presence of a suitable heterogeneous buffer system was found to be essential and best results
Fungicidally active novel substituted azolylethyl oximinoalkyl ethers
申请人:Bayer Aktiengesellschaft
公开号:US04489081A1
公开(公告)日:1984-12-18
Fungicidally active novel substituted azolylethyl oximinoalkyl ethers of the formula ##STR1## in which A is a nitrogen atom or the CH group, R.sup.1 is optionally substituted phenyl, R.sup.2, R.sup.3 and R.sup.4 each independently is hydrogen, alkyl or optionally substituted phenyl, and R.sup.5 is hydrogen, alkyl, alkenyl, alkinyl, optionally substituted phenyl or optionally substituted phenylalkyl, or addition products thereof with acids or metal salts.
A facile synthesis of 2,4,6-trisubstituted pyrimidines from the reaction of α-chloro oxime ethers with Grignard reagents has been developed. Alkyl and aryl groups can be easily introduced at the 2-...