Unnatural Chiral N-tert-Butanesulfinyl α-Amino Acid Synthesis; A General Synthetic Strategy to N-Boc-Phenylalanine Analogue Alternatives
摘要:
This work provides a general approach to unnatural chiral N-tert-butanesulfinyl alpha-amino acid synthesis with high yields and excellent diastereoselectivities (dr up to 98: 2). The asymmetric addition of organometallic reagents to N-tert-butylsulfinyl imino acetate proceeded with excellent diastereo- and regioselectivities even on a 10 mmol scale. The sterically constrained 2',6'-dimethyltyrosine (Dmt) derivative was also readily prepared from commercially available and inexpensive starting materials through simple steps.
This work provides a general approach to unnatural chiral N-tert-butanesulfinyl alpha-amino acid synthesis with high yields and excellent diastereoselectivities (dr up to 98: 2). The asymmetric addition of organometallic reagents to N-tert-butylsulfinyl imino acetate proceeded with excellent diastereo- and regioselectivities even on a 10 mmol scale. The sterically constrained 2',6'-dimethyltyrosine (Dmt) derivative was also readily prepared from commercially available and inexpensive starting materials through simple steps.