The present invention discloses compounds of Formula I, wherein each of R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from H, OBn, OH, CH2OBn, CH2OH, CH3; R9 is selected from alkyl, substituted alkyl, hydroxyl alkyl, alkenyl, benzyl; process for preparation of N-alkylated glycolactam compounds of Formula I and their use for the synthesis of piperidine alkaloids and their analogues.