Asymmetric synthesis of bicyclo[n.1.0]alkanes by the enantioselective 1,3-CH insertion reaction of chiral magnesium carbenoids
作者:Tsuyoshi Satoh、Takayuki Kuramoto、Shingo Ogata、Hiroyuki Watanabe、Takahito Saitou、Makoto Tadokoro
DOI:10.1016/j.tetasy.2009.12.027
日期:2010.1
Treatment of enantiomerically pure 1-chlorovinyl p-tolyl sulfoxides, derived from cyclic ketones and (R)-chloromethyl p-tolyl sulfoxide, with the lithium enolate of tert-butyl carboxylates gave adducts in quantitative yields as single diastereomers. The adducts were treated with i-PrMgCl in toluene to afford optically active bicyclo[n.1.0]alkanes bearing a tert-butyl carboxylate moiety in up to 99% enantiomeric
用叔丁基羧酸盐的烯醇锂处理由环状酮和(R)-氯甲基对甲苯基亚砜衍生的对映体纯的1-氯乙烯基对甲苯基亚砜,以定量收率得到加合物,作为单一的非对映异构体。该加合物用处理我在甲苯-PrMgCl,得到光学活性的双环[ Ñ .1.0]烷烃带有叔丁基羧酸酯部分在高达99%的对映体过量通过生成的手性镁的对映选择性1,3-插入CH反应类胡萝卜素。这是类胡萝卜素镁的对映选择性1,3-CH插入反应的第一个例子。