Studies towards complex bridged alkaloids: regio- and stereocontrolled enolate chemistry of 2,5-diketopiperazines
作者:Mark Pichowicz、Nigel S. Simpkins、Alexander J. Blake、Claire Wilson
DOI:10.1016/j.tet.2008.02.020
日期:2008.4
N-protected diketopiperazines (DKPs) via enolate intermediates has been studied. The enolate reactions were highly diastereocontrolled, leading to enantiopure DKP products if chiral amino acid precursors were employed, and giving racemic products, starting with centrosymmetric DKPs, even when a chiral lithium amide base was used to generate the lithium enolate. With unsymmetrical DKPs derivedfrom proline