212195-36-3Relevant articles and documents
Asymmetric synthesis of α-substituted N-methylsulfonamides
Enders, Dieter,Thomas, Christian R.,Vignola, Nicola,Raabe, Gerhard
, p. 3657 - 3677 (2007/10/03)
A novel amine auxiliary for the asymmetric synthesis of α-substituted N-methylsulfonamides is described. The reaction of 4-([1,1′-biphenyl]-4-yl)-2,2-dimethyl-1,3-dioxan-5-amine (16) with various aliphatic sulfonyl chlorides afforded the corresponding sulfonamides, which were lithiated and subsequently reacted with electrophiles to give the corresponding products in high yields and good-to-excellent asymmetric inductions (de 83-95%). Racemization-free cleavage of the auxiliary led to the α-alkylated N-methylsulfonamides in acceptable yields and high enantiomer purities (ee 91 to ≥ 98).