Selective. gamma.-substitution of. alpha.,. beta.-unsaturated esters via. alpha.-trimethylsilyl. beta.,. gamma.-unsaturated esters

~%

~%

~%

~%

~%

~%

~0%

~%

~%

~%

~21%

~25%

~%

~89%

~53%

~%

~10%

~%

~16%

~%

~%

~%