The rotamers of 1-methyl-9-[2â²-(methoxymethyl)-1â²-naphthyl]fluorene 10 and 11 were synthesised enantioselectively via ligand coupling reactions of 1-(alkyl or arylsulfinyl)naphthalene-2-carboxylate esters with 1-methylfluorenyllithium and the absolute configurations established by a single crystal X-ray study of the (1R)-menthyl ester 4; deprotonation of 10 and 11 affords fluorenyl carbanions, ent-12 and 12, respectively, which retain axial chirality.
通过 1-(烷基或芳基亚磺酰基)
萘-2-
甲酸酯与
1-甲基芴基
锂的配位偶联反应,对映体选择性地合成了 1-甲基-9-[2â²-(甲氧基甲基)-1â²-
萘]
芴 10 和 11 的转子,并通过对 (1R)- 门酯 4 的单晶 X 射线研究确定了其绝对构型;10 和 11 的去质子化反应分别产生保留轴向手性的
芴基碳离子 ent-12 和 12。