<2R-(2R*,4S*,5R*,8S*)>-10-(Benzoyloxy)-5-hydroxy-4,6-dimethoxy-2,8-dimethyldecanoic acid methyl ester 在
4 A molecular sieve 、
对甲苯磺酸 作用下,
以
二氯甲烷 为溶剂,
以93%的产率得到<3R-<3α,5α,6β(1S*,3S*)>>-6-<5-(Benzoyloxy)-1-methoxy-3-methylpentyl>tetrahydro-5-methoxy-3-methyl-2H-pyran-2-one