Propose an efficient synthesis for the following transformation:

The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary

reagent$($s$)$ in the correct order, as a string of letters $($without spaces or punctuation, such as "EBF"$).$ If there is more than one

correct solution, provide just one answer.

A$.$ MeONa

B$.1)xsNaN{H}_2$;$2H_{2}O$

C$.$ t$-$BuOK

D$.TsCl,$ py

E$.$ dilute $H_{2}S{O}_4$

F$.B{r}_2$

G$.HBr,\frac{R}{O}OR$

H$.1)B{H}_3-$THF; $2)H_2{O}_2,$NaOH

I. $HBr$