Isophthalic acid 1-[(2S,3R,4S,5S,6R)-6-(tert-butyl-diphenyl-silanyloxymethyl)-4,5-dihydroxy-2-methoxy-tetrahydro-pyran-3-yl] ester 3-((2R,3S,4S,5R,6S)-3,4,5-trimethoxy-6-phenylsulfanyl-tetrahydro-pyran-2-ylmethyl) ester 在
N-碘代丁二酰亚胺 、 4 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
以39%的产率得到(1R,3S,4R,5R,7S,8R,19R,20S,21S,22R)-5-[[tert-butyl(diphenyl)silyl]oxymethyl]-4-hydroxy-7,20,21,22-tetramethoxy-2,6,9,17,23-pentaoxatetracyclo[17.3.1.111,15.03,8]tetracosa-11,13,15(24)-triene-10,16-dione