Carbamic acid (E)-1-(tert-butyl-dimethyl-silanyloxymethyl)-4-methyl-penta-2,4-dienyl ester 在
吡啶 、
氯化亚砜 、 copper dichloride 作用下,
以
二氯甲烷 为溶剂,
以79%的产率得到(4aR,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-3-methyl-1-oxo-1,2,4a,5-tetrahydro-1λ
4-oxazolo[3,4-b][1,2]thiazin-7-one