2,6-Piperidinediones, I. Synthesis of the Racemates and the Enantiomers of 3,3-Disubstituted 2,6-Piperidinediones
作者:Joachim Knabe、Dirk Reischig
DOI:10.1002/ardp.19843170413
日期:——
The synthesis of the racemates and the enantiomers of the 3,3‐disubstituted 2,6‐piperidinediones 3a–3g is performed in three ways, depending on the C‐3 substituents. The 3‐cyclohexylpiperidinedione 3h is obtained as racemic and optically active compound by hydrogenation of the cyclohexenyl compound 3e with Pd/C. The N‐methylpiperidinediones 7a and 7b are obtained by methylation of 3a and 3b with CH2N2