1,2-乙二硫醇 、
2,2-二甲氧基丙烷 、 [(2S,4R,6S)-6-(tert-Butyl-diphenyl-silanyloxymethyl)-4-hydroxy-2-methoxy-3,3-dimethyl-tetrahydro-pyran-2-yl]-acetic acid tert-butyl ester 在
camphor-10-sulfonic acid 、
三氟化硼乙醚 作用下,
生成
(R)-9-((S)-2,2-Dimethyl-[1,3]dioxolan-4-ylmethyl)-10,10-dimethyl-8-oxa-1,4-dithia-spiro[4.5]decan-7-one