received by the International Bureau on 10 September 2013(10.09.2013)

We claim:

1. A one pot, single step process for the preparation of compound of general formula A and its isomers,

Formula A

starting from compounds of formula I,

Formula I,

wherein,

R¹ is hydrogen;

R² is selected from H, OMe, OTs, Obn;

R³ is selected from H, OMe, OTs, OBn, N0₂;

R* is selected from H, OMe, F;

R⁵ is selected from H, N02, BR;

R^5' is selected from H, N02, CN;

R* and R³ can together be selected as -0-CH.-0-;

comprising the steps of reacting compound of formula I with CuCN in DMF, under reflux in presence of atmosphere to obtain the desired compound of Formula A in the range of 50% -90% yield.

2. The process according to claim 1, wherein said compound of formula I and CuCN are in the ratio of 1:2 to 1:3.

3. The process according to claim 1, wherein said isomers of compound of formula A are trans and cis isomers in the ratio of 3: 1 to 10:1.

4. The process according to claim 1, wherein the reaction is carried out at a temperature ranging from 140 to 160 °C.

5. The process according to claim 1, wherein the reaction is carried out for a time ranging from 10 to 15 hours.