Propose an efficient synthesis for the given transformation.

This transformation 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

NaH

F

MeMgBr;$2)H_3{O}^{+}Na,N{H}_3(I)$

L DMP or PCC

B

$\frac{?}{{?}_{\frac{?}{?}}^0}$;$2)H_3{O}^{+}$

G

C

$H$

D

$Mg$

I

MCPBA

$(RC{O}_{3}H)$

EtMgBr; $2)H_3{O}^{+}$

M

N

$SOC{l}_2,$ pyridine

EtBr

$B{H}_3*THF$; $2)H_2{O}_2,$