Nickel powder promoted 5-endo radical cyclisations. A concise approach to Erythrina alkaloids
作者:Jérôme Cassayre、Béatrice Quiclet-Sire、Jean-Baptiste Saunier、Samir Z. Zard
DOI:10.1016/s0040-4039(98)02036-x
日期:1998.12
N-Alkenyl trichloroacetamides 3 undergo, upon refluxing with nickel powder and acetic acid in 2-propanol, exclusive 5-endo-trig cyclisation to afford functionalised lactams 4; these are attractive precursors of erythrina alkaloids, as demonstrated by the expedient synthesis of 3-demethoxyerythratidinone 5.
N-链烯基三氯乙酰胺3与镍粉和乙酸在2-丙醇中回流后,进行专门的5-endo-trig环化反应,得到官能化的内酰胺4。这些是erythrina生物碱的有吸引力的前体,如3-demethoxyerythratidinone 5的权宜合成证明。