Abstract: The present invention discloses a process for the preparation of pregnadiene derivatives having formula I, their stereoisomer and intermediate thereof.

Abstract: The present invention discloses a process for the preparation of 16, 17-acetals of pregnane derivatives having formula I wherein each substituent is independently selected from; R1 is H or CH3; R2 is C1-C6 linear or branched alkyl, alkynyl group or cycloalkyl group; aryl or heteroaryl group; or R1 and R2 combine to form saturated, unsaturated C3-C6 cyclic or heterocyclic ring; R3 and R4 are same or different and each independently represents H or halogen; R5 is —OH or —OCOR wherein R represents H or C1-C6 linear, branched or cyclic alkyl group that may be substituted.

Abstract: The present invention discloses a process for the preparation of 16, 17-acetals of pregnane derivatives having formula I wherein each substituent is independently selected from; R1 is H or CH3; R2 is C1-C6 linear or branched alkyl, alkynyl group or cycloalkyl group; aryl or heteroaryl group; or R1 and R2 combine to form saturated, unsaturated C3-C6 cyclic or heterocyclic ring; R3 and R4 are same or different and each independently represents H or halogen; R5 is —OH or —OCOR wherein R represents H or C1-C6 linear, branched or cyclic alkyl group that may be substituted.