Diethoxymethyl: A Useful Nitrogen-Protecting Group for Lactams and Amides
作者:Peter Gmeiner、Bernd Bollinger
DOI:10.1055/s-1995-3868
日期:1995.2
Treatment of the lactams 3a-e and the amide 3f with triethyl orthoformate leads to the N-diethoxymethyl substituted derivatives 4a-f. Additionally, the indolinones 3a and 3b can react at the lactam α-position to give the reaction products 2 and 5, respectively. The diethoxymethyl group can be easily removed by subsequent treatment with trifluoroacetic acid and NaOH.