Utilisation du groupement cyanométhyle comme motif protecteur des phénols, amines et carbamates
摘要:
The use of the cyanomethyl unit as a protecting group for phenols, primary and secondary amines, and carbamates is described. Optimized conditions for formation and hydrolysis of cyanomethyl in the presence of the other hydrogenolysis-sensitive groups such as O- and N-benzyl groups are presented.
A tandem Diels–Alder/Mannich approach to the synthesis of AE and ABE ring analogues of Delphinium alkaloids
作者:Kirsten J. Goodall、Margaret A. Brimble、David Barker
DOI:10.1016/j.tet.2012.05.037
日期:2012.7
The one-pot TiCl4 catalysed Diels–Alder/Mannich reaction of α-cyanoaminoacrylates with 2-silyloxy-1,4-butadienes gives 6-keto-3-azabicyclo[3.3.1]nonane-1-carboxylates. Reduction of the ketone and alkylation of the resultant alcohol gives 6-alkoxy-3-azabicyclo[3.3.1]nonanes mimicking the AE rings of a number of Delphinium and Aconitum alkaloids, with the same stereochemistry as the natural products