Synthesis 2010(19): 3301-3308  
DOI: 10.1055/s-0030-1257872
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

A Synthetic View of an Analogue of the Spiro-β-lactone-γ-lactam Ring in Oxazolomycins and Lajollamycin

Dhananjoy Mondal*, Smritilekha Bera
Organic Chemistry Division, National Chemical Laboratory, Pune 411008, India
Fax: +91(20)25902629; e-Mail: dhananjoym@yahoo.com;
Further Information

Publication History

Received 23 March 2010
Publication Date:
22 July 2010 (online)

Abstract

Herein, we describe a new synthetic strategy towards an analogue of the spiro-β-lactone-γ-lactam ring found in a class of potent antibiotics, the oxazolomycins and lajollamycin. The synthetic idea relies on the construction of two rings (β-lactone and pyrrolidinone). The formation of the spiro-β-lactone was accomplished by a crossed Cannizzaro reaction, while the 3,4-disubstituted pyrrolidinone ring was constructed by a titanium(IV) chloride mediated chelation-controlled double stereodifferentiating Crimmins aldol reaction of Garner’s aldehyde.