α-bromo-isovaleric acid-anhydride 、
(2S,4R,13R,14E,16Z,20R,21S,23S)-(+)-24-Amino-13-ethyl-20,21,23-trihydroxy-17-methoxymethyl-2,4-dimethyl-9-oxo-14,16-tetracosadiensaeure 在
三乙胺 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以92%的产率得到(2S,4R,13R,14E,16Z,20R,21S,23S)-(+)-24-(2-Brom-3-methyl-1-oxobutylamino)-13-ethyl-20,21,23-trihydroxy-17-methoxymethyl-2,4-dimethyl-9-oxo-14,16-tetracosadiensaeure