THF,ether 1.)adding of organo-lithium compound at 20 deg C, then 1h, 2.)adding of BuBr/HMPT at 20 deg C, then 1h at 80 deg C; Yield given. Multistep reaction;

(i) nBuLi, Et2O, (ii) /BRN= 1428508/, Et2O, HMPT; Multistep reaction;

(i) MeLi, Et2O, (ii) /BRN= 1901500/; Multistep reaction;