(S)-3-Hydroxy-2-[(E)-4-((3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-yl)-but-2-enoylamino]-propionic acid methyl ester 在
伯吉斯试剂 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以71%的产率得到(S)-2-[(E)-3-((3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-yl)-propenyl]-4,5-dihydro-oxazole-4-carboxylic acid methyl ester