Synthesis 2004(18): 2965-2974  
DOI: 10.1055/s-2004-834890
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Polycyclic β-Lactams from d-Glucose Derived Chiral Template via Substrate-Controlled Radical Cyclization

Abdul Rakeeb A. S. Deshmukh*a, Arumugam Jayanthia, Kamanan Thiagarajana, Vedavati G. Puranikb, Baburao M. Bhawalc
a Division of Organic Chemistry (Synthesis), National Chemical Laboratory, Pune 411 008, India
b Division of Physical Chemistry, National Chemical Laboratory, Pune 411 008, India
c Emcure Pharmaceuticals Ltd., Emcure House, T-184, M. I. D. C. Bhosari, Pune 411026, India
Fax: +91(20)25893153; Fax: +91(20)25893355; e-Mail: arasd@dalton.ncl.res.in;
Further Information

Publication History

Received 7 July 2004
Publication Date:
22 October 2004 (online)

Abstract

A highly stereoselective and substrate-controlled synthesis of polycyclic β-lactams from d-glucose derived chiral template via intramolecular radical cyclization is described. The cyclization is highly substrate dependant, proceeding via 6-exo and 7-endo heptenyl type radical cyclization with the radical acceptor allyl group at N-1 and the radical progenitor on a sugar moiety, anchored to the β-lactam ring at C-4. The mode of radical cyclization in N-propargyl substrates is highly stereospecific and controlled by the stereochemistry of the β-lactam ring.