分子内环化:Acésaux 9-oxo-4 H,9 H -pyrrolo [1,2- a ] thieno [2,3- d ] pyridine et 4-oxo-4 H,9 H -pyrrolo [1,2- a ] thieno [2,3- d ]吡啶。吡咯并[1,2- a ]噻吩并[3,2- e ] [1,4]二氮杂et和吡咯并[1,2- a ]噻吩并[2,3- e ] [1,4]二氮杂pine
分子内环化:Acésaux 9-oxo-4 H,9 H -pyrrolo [1,2- a ] thieno [2,3- d ] pyridine et 4-oxo-4 H,9 H -pyrrolo [1,2- a ] thieno [2,3- d ]吡啶。吡咯并[1,2- a ]噻吩并[3,2- e ] [1,4]二氮杂et和吡咯并[1,2- a ]噻吩并[2,3- e ] [1,4]二氮杂pine
Palladium-Catalyzed Regioselective Alkynylation of Pyrroles and Azoles under Mild Conditions: Application to the Synthesis of a Dopamine D-4 Receptor Agonist
作者:Etienne Brachet、Philippe Belmont
DOI:10.1021/acs.joc.5b01093
日期:2015.8.7
A mild and general method for the direct alkynylation of azoles such as pyrrole, indole, and 7-azaindole is described here. Using a simple catalytic system such as Pd(OAc)(2) (2.5 mol %), P(tBu)(2)Me center dot HBF4 (5 mol %), and NaOAc (2 equiv) allowed the regioselective introduction of various alkynyl residues at the C-2 position of pyrroles. Interestingly, C-2 alkynylation was also observed on C-3-substituted indoles, whereas classical C-3 alkynylation was obtained on selected unsubstituted indoles and 7-azaindole. Our methodology has been illustrated by the efficient synthesis of a potential schizophrenia drug (dopamine D-4 inhibitor).
DECROIX, BERNARD;MOREL, JEAN, J. HETEROCYCL. CHEM., 28,(1991) N, C. 81-87