2-Phenyl-1,3-dioxolanes (1) react with organolithium reagents (2), associated with (-)-sparteine, in the presence of BF3. OEt2 to afford chiral monosubstitution products 3, Enantioselectivity is highest if both 1 and 2 carry alkyl substituents in the ortho position. However, the enantioselectivity decreases in the case of very bulky substituents such as tert-butyl or phenyl.
机构:
Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA
Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA
Hefei Univ Technol, Sch Sci & Engn Mat, Hefei 230009, Anhui, Peoples R ChinaUniv Nebraska, Dept Chem, Lincoln, NE 68588 USA
Zhou, Rulong
Zeng, Xiao Cheng
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机构:
Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA
Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USAUniv Nebraska, Dept Chem, Lincoln, NE 68588 USA