A convenient preparation of 1,4-dihydro-1-methyl-4-oxo-2-quinolinecarboxaldehyde from<i>N</i>-methylisatoic anhydride
作者:Gary M. Coppola
DOI:10.1002/jhet.5570230623
日期:1986.11
The dianion of hydroxyacetone is readily generated with LDA in THF at -65°. This dianion reacts rapidly with N-methylisatoic anhydride (6) at -65° to furnish 2-hydroxymethyl-1-methylquinolin-4(1H)-one (12). The alcohol is oxidized to aldehyde 4 with manganese dioxide, and is subsequently converted to α,β-unsaturated ester 5 under Horner-Emmons conditions.
羟丙酮的二价阴离子很容易与LDA在-65°的THF中生成。该二价阴离子在-65°时与N-甲基isatoic酐(6)快速反应,得到2-羟甲基-1-甲基喹啉4(1 H)-one(12)。该醇被二氧化锰氧化为醛4,随后在霍纳-埃蒙斯条件下转化为α,β-不饱和酯5。