Self-reproduction of chirality. Asymmetric synthesis of .beta.-aryl-.beta.-amino acids from enantiomerically pure dihydropyrimidinones
作者:Joseph P. Konopelski、Kent S. Chu、George R. Negrete
DOI:10.1021/jo00004a005
日期:1991.2
Enantiomerically pure dihydropyrimidinone 1 reacts with aryl iodides in the presence of catalytic amounts of Pd(OAc)2 and added phosphine to afford dihydropyrimidinone 4, in which a formal conjugate addition of the aryl group to the alpha,beta-unsaturated system has occurred. Application of this methodology to the synthesis of a protected version of the tripeptide portion of the natural product jasplakinolide is presented.
KONOPELSKI, JOSEPH P.;CHU, KENT S.;NEGRETE, GEORGE R., J. ORG. CHEM., 56,(1991) N, C. 1355-1357
作者:KONOPELSKI, JOSEPH P.、CHU, KENT S.、NEGRETE, GEORGE R.
DOI:——
日期:——
Enantiomerically pure dihydropyrimidinones as reagents and auxiliaries for asymmetric synthesis
作者:Kent S. Chu、George R. Negrete、Joseph P. Konopelski、Frederick J. Lakner、Nam Tae Woo、Marilyn M. Olmstead
DOI:10.1021/ja00031a039
日期:1992.2
determined by X-ray crystallographic analysis, demonstrates significant pyramidalization at the C4 (carbonyl) and N1 centers, with little evidence of conjugation of N1 with the α,β-unsaturated (vinylogousurea) system