N-Boc-α-tosylsarcosine ethyl ester: An α-amido sulfone for the regio- and stereoselective synthesis of protected γ,δ-unsaturated N-methyl-α-amino acids by palladium-catalyzed nucleophilic substitution
摘要:
N-Boc-alpha-tosylsarcosine ethyl ester (3) reacts under neutral conditions either with allylic carbonates or with vinyloxirane in the presence of a catalytic amount of Pd(PPh3)(4) and dppe (5 mol%) to give regio- and stereoselectively the corresponding allylated products 5 and 6, respectively. Reductive desulfonylation of these compounds with Mg-MeOH affords the corresponding protected gamma,delta-unsaturated N-methyl-alpha-amino acids 7 and 8. (C) 1997 Elsevier Science Ltd.
N-Boc-α-tosylsarcosine ethyl ester: An α-amido sulfone for the regio- and stereoselective synthesis of protected γ,δ-unsaturated N-methyl-α-amino acids by palladium-catalyzed nucleophilic substitution
摘要:
N-Boc-alpha-tosylsarcosine ethyl ester (3) reacts under neutral conditions either with allylic carbonates or with vinyloxirane in the presence of a catalytic amount of Pd(PPh3)(4) and dppe (5 mol%) to give regio- and stereoselectively the corresponding allylated products 5 and 6, respectively. Reductive desulfonylation of these compounds with Mg-MeOH affords the corresponding protected gamma,delta-unsaturated N-methyl-alpha-amino acids 7 and 8. (C) 1997 Elsevier Science Ltd.
N-Boc-α-tosylsarcosine ethyl ester: An α-amido sulfone for the regio- and stereoselective synthesis of protected γ,δ-unsaturated N-methyl-α-amino acids by palladium-catalyzed nucleophilic substitution
作者:Diego A. Alonso、Ana Costa、Carmen Nájera
DOI:10.1016/s0040-4039(97)10054-5
日期:1997.11
N-Boc-alpha-tosylsarcosine ethyl ester (3) reacts under neutral conditions either with allylic carbonates or with vinyloxirane in the presence of a catalytic amount of Pd(PPh3)(4) and dppe (5 mol%) to give regio- and stereoselectively the corresponding allylated products 5 and 6, respectively. Reductive desulfonylation of these compounds with Mg-MeOH affords the corresponding protected gamma,delta-unsaturated N-methyl-alpha-amino acids 7 and 8. (C) 1997 Elsevier Science Ltd.