Catalytic Asymmetric Synthesis of Bicycloprolines by a 1,3-Dipolar Cycloaddition/Intramolecular Alkylation Strategy.
The diastereoselective one-pot synthesis of hexahydrocyclopenta[b]pyrrole derivatives (bicycloprolines) has been achieved by base-mediated reactions of (E)-tert-butyl 6-bromo-2-hexenoate with α-imino esters. The catalytic asymmetric version of this process has been efficiently achieved using the Cu(I)/(R)-DTBM-Segphos complex as a catalyst following a two-step 1,3-dipolar cycloaddition/intramolecular alkylation sequence.
Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.
Enrique M
EM
Arpa
Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.
María
M
González-Esguevillas
Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.
Ana
A
Pascual-Escudero
Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.
Javier
J
Adrio
Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.
Juan C
JC
Carretero