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。