描述:
3-[(S)-(2-tert-butyldimethylsilyloxy)-2-phenylacetyl]-3-[5-methoxy-1,2-dihydrobenzocyclobuten-1-yl]-6,9-divinyl-1-oxaspiro[4,4]nonan-2-one 以4.2%的产率得到(8β,9α,14β)-11β-[2(S)-2-(tert-butyldimethylsilyloxy)-2-phenylacetyl]-11α,13α-(γ-lactone)-2-methoxy-17β-vinylgona-1,3,5(10)-triene