Stereoselective Iodocyclization of (S)-Allylalanine Derivatives: γ-Lactone vs Cyclic Carbamate Formation
摘要:
An efficient procedure for highly chemo- and stereoselective cyclization of (S)-allylalanine derivatives is reported (diastereomeric ratios up to 96:4) where the reaction course can be completely controlled by switching from gamma-lactones to cyclic carbamates simply with the proper choice of the amino acid protecting groups. Both processes are stereoconvergent and afford the (S,S)-products in high yields, short reaction times, and mild reaction conditions.
Stereoselective Iodocyclization of (S)-Allylalanine Derivatives: γ-Lactone vs Cyclic Carbamate Formation
摘要:
An efficient procedure for highly chemo- and stereoselective cyclization of (S)-allylalanine derivatives is reported (diastereomeric ratios up to 96:4) where the reaction course can be completely controlled by switching from gamma-lactones to cyclic carbamates simply with the proper choice of the amino acid protecting groups. Both processes are stereoconvergent and afford the (S,S)-products in high yields, short reaction times, and mild reaction conditions.
Stereoselective Iodocyclization of (<i>S</i>)-Allylalanine Derivatives: γ-Lactone vs Cyclic Carbamate Formation
作者:Mariella Pattarozzi、Cristiano Zonta、Quirinus B. Broxterman、Bernard Kaptein、Rita De Zorzi、Lucio Randaccio、Paolo Scrimin、Giulia Licini
DOI:10.1021/ol070764k
日期:2007.6.1
An efficient procedure for highly chemo- and stereoselective cyclization of (S)-allylalanine derivatives is reported (diastereomeric ratios up to 96:4) where the reaction course can be completely controlled by switching from gamma-lactones to cyclic carbamates simply with the proper choice of the amino acid protecting groups. Both processes are stereoconvergent and afford the (S,S)-products in high yields, short reaction times, and mild reaction conditions.