(-)-(3'aS-cis)-N-[3',3'a,4',6'a-tetrahydro-5,5-dimethylspiro[1,3-dioxane-2,2'(1'H)-pentalen-5'-yl]]-N'-(p-toluenesulfonyl)diazene 、
(E)-1-(4-iodobut-3-enyl)-3-methylbenzene 、
三正丙基氯化锡 以79%的产率得到(E)-N'-{(3a'S,4'R,6a'R)-5,5-dimethyl-4'-[(E)-4-m-tolylbut-1-enyl]dihydro-1'H-spiro([1,3]dioxane-2,2'-pentalene)-5'-(3'H,6'H,6a'H)ylidene}-4-methylbenzenesulfonohydrazide