Synthesis of 1,2,3,6-Tetrahydropyridines via Aminophosphate Enabled Anionic Cascade and Acid Catalyzed Cyclization Approaches
摘要:
Two new approaches for forming 1,2,3,6-tetrahydropyridines are reported. Both reactions employ a strategic phosphate substituent on e nitrogen atom. In the presence of an additional phosphate substituent (X = P = 0(OEt)(2)) an anionic cascade can by triggered upon treatment with base. Alternatively, when X = H the same 1,2,3,6-tetrahydropyridine product can be accessed via an acid catalyzed cyclization.
A Protocol for Accessing the β-Azidation of α,β-Unsaturated Carboxylic Acids
摘要:
This contribution reports the preparation and use of a new immobilized catalyst, PS-DABCOF (9), which has been specifically designed to access for the first time the efficient beta-azidation of alpha,beta-unsaturated carboxylic acids.