Mj. Coleman et al., A convenient method for the N-acylation and esterification of hindered amino acids: Synthesis of ultra short acting opioid agonist, remifentanil, SYNLETT, (12), 1999, pp. 1923-1924
A general method has been devised for the one step preparation of N-acylami
no acid esters of type 7 from the corresponding alpha-amino acids in high y
ield under mild conditions and a probable mechanism is proposed.