10606-66-3Relevant academic research and scientific papers
Enantio- and diastereoselective cyclopropanation with tert-butyl α-diazopropionate catalyzed by dirhodium(II) tetrakis[N- tetrabromophthaloyl-(S)-tert-leucinate]
Goto, Takayuki,Takeda, Koji,Anada, Masahiro,Ando, Kaori,Hashimoto, Shunichi
supporting information; experimental part, p. 4200 - 4203 (2011/09/19)
The first successful example of a catalytic asymmetric cyclopropanation with α-diazopropionates is described. The cyclopropanation reaction of 1-aryl-substituted and related conjugated alkenes with tert-butyl α-diazopropionate has been achieved by catalysis with dirhodium(II) tetrakis[N-tetrabromophthaloyl-(S)-tert-leucinate], Rh2(S-TBPTTL) 4, providing the corresponding cyclopropane products containing a quarternary stereogenic center in good to high yields and with high diastereo- and enantioselectivities (trans:cis = 90:10 to >99:1, 81-93% ee).
