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

reagents 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$.$ PCC or DMP

B$.$ NaCN

C$.[H^{+}],$EtOH

D$.H_3{O}^{+},$ heat

E$.$ excess $C{H}_{3}N{H}_2$

F$.1)E{t}_2$CuLi; $2)H_3{O}^{+}$

G$.N{a}_{2}C{r}_2{O}_7,H_{2}S{O}_4,H_{2}O$

H$.1)LiAl{H}_4$; $2)H_3{O}^{+}$

I. $1)C{O}_2$; $2)H_3{O}^{+}$

$SOC{l}_2$

K$.$Mg

L$.1)$ EtMgBr; $2)H_3{O}^{+}$

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Hint