Efficient Synthesis of 2-Vinyl-γ-butyrolactones and 2-Vinyl-γ-butyrolactams by Palladium-Catalyzed Decarboxylative Carbonylation
作者:Takashi Bando、Shuji Tanaka、Keigo Fugami、Zen-ichi Yoshida、Yoshinao Tamaru
DOI:10.1246/bcsj.65.97
日期:1992.1
4-Vinyl-1,3-dioxan-2-ones (cyclic carbonates) undergo decarboxylation-carbonylation by the catalysis of Pd(0) species under CO (in most cases, 1 atm) to provide 2-vinyl-γ-butyrolactones in good yields. The course of the reaction of 6-vinyltetrahydro-2H-1,3-oxazin-2-ones (cyclic carbamates) depends on the substituent on the nitrogen atom. When it is H or Ts (and COPh), 2-vinyl-γ-butyrolactams or 6-amino-3-hexenoic acid esters are obtained. Cyclic N-benzylcarbamates are unreactive. trans-2,3-Disubstituted lactones and lactams arise stereoselectively from carbonates and carbamates, irrespective of their stereochemistry, respectively.
4-乙烯基-1,3-二恶烷-2-酮(环状碳酸酯)在 CO(大多数情况下为 1 个大气压)下,通过 Pd(0) 物质的催化作用进行脱羧-羰基化,生成 2-乙烯基-γ-丁内酯良好的产量。 6-乙烯基四氢-2H-1,3-恶嗪-2-酮(环状氨基甲酸酯)的反应过程取决于氮原子上的取代基。当它是H或Ts(和COPh)时,获得2-乙烯基-γ-丁内酰胺或6-氨基-3-己烯酸酯。环状N-苄基氨基甲酸酯不具有反应性。反式2,3-二取代内酯和内酰胺分别立体选择性地由碳酸酯和氨基甲酸酯产生,无论其立体化学如何。