1.
Org Lett
; 5(24): 4537-40, 2003 Nov 27.
Article
in English
| MEDLINE
| ID: mdl-14627377
ABSTRACT
[reaction: see text] Cobalt-mediated [2 + 2 + 2] cycloaddition of alpha,omega-diynes and isocyanates provides a direct approach to macrocyclic 2-oxopyridinophanes. This macrocyclization process, which proceeded most efficiently with aliphatic isocyanates, was conveniently performed at a moderate temperature (85 degrees C) without irradiation or syringe-pump addition.