Unexpected formation of new chiral 3-amino-5-alkyl-2,5-dihydro-1H-pyrrolin-2-ones from N-Boc-α-amino esters
作者:Nicolas Inguimbert、Hélène Dhôtel、Pascale Coric、Bernard P. Roques
DOI:10.1016/j.tetlet.2005.03.067
日期:2005.5
We describe a one-pot process involving the DiBA1-H reduction of the ester moiety of N-protected α-amino esters, followed by Horner-Wadsworth-Emmons olefination in the presence of the trimethyl ester phosphonoglycinate carbanion allowing the formation of new chiral 3-amino-5-alkyl-2,5-dihydro-IH pyrrolin-2-one 5. The Z-enoate 4b, which is formed during this reaction, could be converted into the corresponding lactam 5b under UV irradiation with the presence of BuLi. © 2005 Elsevier Ltd. All rights reserved.