A convenient synthesis of 2-methoxy-1-naphthyl sulfoxides in high enantiomeric purity. A new asymmetric synthesis of 1-benzyl-1,2,3,4-tetrahydroisoquinolines
作者:Stephen G. Pyne、A.R. Hajipour、K. Prabakaran
DOI:10.1016/s0040-4039(00)75860-6
日期:1994.1
The synthesis of diastereomerically pure (-)-(S) menthyl 2-methoxy-1-naphthalenesulfinate (5) is reported. The reaction of (5) with methylmagnesium iodode or benzylmagnesium chloride gives (+)-(R) methyl and (+)-(R) benzyl 2-methoxy-1-naphthyl sulfoxide, (7) and (8) respectively, in high enantiomeric purity (98% ee). Lithiated (8) undergoes addition to 6,7-dimethoxy-3,4-dihydroisoquinoline N-oxide
据报道合成了非对映体纯的(-)-(S)2-甲氧基-1-萘亚磺酸薄荷酯(5)。(5)与甲基碘化镁或苄基氯化镁的反应分别得到(+)-(R)甲基和(+)-(R)苄基2-甲氧基-1-萘亚砜,分别为(7)和(8)。对映体纯度(98%ee)。将锂化的(8)加入6,7-二甲氧基-3,4-二氢异喹啉N-氧化物(2)中,得到具有高产物非对映选择性(dr)的1-苄基-1,2,3,4-四氢异喹啉衍生物(9) 96:4)。通过单晶X射线结构测定来确定(9)的立体化学。