NOVELTY - Preparing 2-substituted indolines and 3-substituted cinnolines (I), comprises: e.g. (a) adding aldehyde to a cooled solution of azodicarboxylate compound and L-proline in solvent, and stirring mixture at 60-130 degrees C for 4-24 hours to obtain colorless reaction mixture; (b) treating colorless reaction mixture with reducing agent to obtain hydrazines; (c) adding allyl bromide, activated zinc and aqueous ammonium chloride to obtained hydrazines followed by filtration to obtain suspension of chiral oxazolidinone (Ig); and (d) reacting (Ig) with ethyl bromoacetate and base in a solvent.    USE - The process is useful for preparing 2-substituted indolines and 3-substituted cinnolines (I) (claimed), which are useful for treating urinary tract infection, and in synthesis of bioactive natural products. No biological data given.    ADVANTAGE - The process provides (I), which have enantiomeric purity of greater than 98% or greater than 60% (all claimed) and exhibit improved yield and enantioselectivities from easily accessible starting materials, in a one step process, hence it is simple, cost effective and environmental friendly.    DETAILED DESCRIPTION - Preparing 2-substituted indolines and 3-substituted cinnolines of formula (I), comprises: (a) adding aldehyde to a cooled solution of azodicarboxylate compound and L-proline in solvent, and stirring the mixture at 60-130 degrees C for 4-24 hours to obtain a colorless reaction mixture; (b) treating the obtained colorless reaction mixture with a reducing agent to obtain hydrazines; (c) adding allyl bromide, activated zinc and aqueous ammonium chloride to the obtained hydrazines followed by filtration to obtain suspension of chiral oxazolidinone of formula (Ig); (d) reacting (Ig) with ethyl bromoacetate and a base in a solvent; and (e) reacting compound of step (c) in presence of a catalyst, a ligand and a base followed by heating and stirring the mixture at 60-130 degrees C for 4-24 hours to obtain (I).    R1, R2, R3 = H, OH, O-CH3, NO2, -OCH2O-, halo, -CN or -N3;    R4 = H or allyl;    X1 = absent, or N-COOR5; and    R5 = isopropyl or ethyl.