allyl 3'-O-(5'-O-tert-butyldimethylsilyl)thymidinyl 5'-O-(3'-O-tert-butyldimethylsilyl)-5'(S)-C-vinylthymidinyl phosphoric ester 在
RuCl2(1,3-dimesityl-imidazolidin-2-yl)(PCy3)(=CHPh) 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以33%的产率得到1(S
P)-(2(R)-(tert-butyldimethylsilyl)oxymethyl-5(R)-(thymin-1-yl)tetrahydrofuran-3(S)-oxyl)-3(S)-(3(S)-(tert-butyldimethylsilyl)oxy-5(R)-(thymin-1-yl)tetrahydrofuran-2(S)-yl)-1-oxo-3,6-dihydro-2,7-dioxaphosphepine