An efficient synthesis of enantiomerically pure 3-hydroxy-β-lactams via zinc induced removal of a chiral auxiliary
作者:Sudhir N Joshi、A.R.A.S Deshmukh、B.M Bhawal
DOI:10.1016/s0957-4166(00)00098-7
日期:2000.4
The diastereoselective synthesis of various beta-lactams 6a-d and 7a-d has been achieved using a chiral acid derived from (+)-+-carene. An efficient zinc induced cleavage of the o-halo ether linkage of these beta-lactams to give enantiomerically pure 3-hydroxy-cis-beta-lactams 8a,b and 9a-d is described. (C) 2000 Elsevier Science Ltd. Ail rights reserved.
Microwave-Induced Enantiospecific Synthesis of trans-(3R,4R)-3-Acetoxy-4-aryl-1-(chrysen-6-yl)azetidin-2-ones via the Staudinger Cycloaddition Reaction of (+)-Car-3-ene with Polyaromatic Imines
作者:A. L. Shaikh、R. N. Yadav、B. K. Banik
DOI:10.1134/s1070428020050267
日期:2020.5
AbstractThe enantiospecific synthesis of 3-acetoxy-trans-β-lactams via the Staudinger [2+2] cycloaddition reaction of polyaromatic imines with bicyclic (+)-car-3-ene was investigated. The sterically hindered polyaromatic substituent at the N1 position in the imines plays a significant role, directing the cycloaddition reaction to stereoselective formation of trans-(3R,4R)-N-azetidin-2-ones. The results
Diastereospecific synthesis of novel tetracyclic β-lactams via 6-exo-trig radical cyclization
作者:Sudhir N. Joshi、V.G. Puranik、A.R.A.S. Deshmukh、B.M. Bhawal
DOI:10.1016/s0957-4166(01)00550-x
日期:2001.12
An efficient and diastereospecific synthesis of a tetracyclic, 3.6.6.4 ring system fused to a β-lactam has been achieved in high yield via 6-exo-trig radicalcyclization.