01258nas a2200217   4500008004100000022001400041245010900055210006900164260010600233300001400339490000700353520038700360653001100747653001200758653003900770653003000809100001900839700002600858700002700884856012900911       2005                        eng d  a0040-402000aSynthesis of cis bis-beta-lactams via Staudinger cycloaddition reaction using C-2-symmetric 1,2-diamines0 aSynthesis of cis bisbetalactams via Staudinger cycloaddition rea  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a2441-24510 v613 a<p>An efficient stereoselective synthesis of bis-beta-lactams via cycloaddition reaction (Staudinger reaction) of ketenes with bisimines derived from C-2-symmetric 1, 2-diamines is described. The reaction provided diastereomeric mixture of meso and C-2-symmetric cis-bis-beta-lactams with higher selectivity for meso-bis-beta-lactams. (C) 2005 Elsevier Ltd. All rights reserved.</p>10aimines10aketenes10aStaudinger cyclo-addition reaction10astereoselective synthesis1 aShaikh, A., L.1 aPuranik, Vedavati, G.1 aDeshmukh, A., R. A. S.  uhttps://library.ncl.res.in/content/synthesis-cis-bis-beta-lactams-staudinger-cycloaddition-reaction-using-c-2-symmetric-12-001434nas a2200229   4500008004100000022001400041245014500055210006900200260010600269300001400375490000700389520050600396653001100902653001200913653002300925653002400948653003000972100002701002700002601029700002701055856012201082       2007                        eng d  a0040-402000aStereoselective synthesis of spiro-beta-lactams using D-(+)-glucose derived chiral pool: remarkable influence of the torquoelectronic effect0 aStereoselective synthesis of spirobetalactams using Dglucose der  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcSEP  a9179-91870 v633 a<p>Diastereoselective synthesis of spiro-beta-lactams via [2+2] cycloaddition reaction of imines and chiral ketenes is described. The chiral ketene was prepared from commercially available, inexpensive D-glucose. Although, theoretically four diastereomers are possible, the reaction yielded only two diastereomers stereoselectively in good to moderate yields. The stereochemical outcome of the reaction was in accordance with the torquoelectronic model. (c) 2007 Elsevier Ltd. All rights reserved.</p>10aimines10aketenes10aspiro-beta-lactams10aStaudinger reaction10astereoselective synthesis1 aChincholkar, Pinak, M.1 aPuranik, Vedavati, G.1 aDeshmukh, A., R. A. S.  uhttps://library.ncl.res.in/content/stereoselective-synthesis-spiro-beta-lactams-using-d-glucose-derived-chiral-pool-0