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A novel and practical procedure was developed for the preparation of D-ring unsaturated 17-alkynyl steroids by Pd(PPh 3 ) 4 /AgOAc-catalyzed coupling of steroidal 17-triflates and alkynes. Firstly treatment of the steroid-17-ones with PhN(Tf) 2 and KHMDS in dried THF at −78°C for 2h gives the corresponding steroidal 17-triflates products in high yields (97–98%), following the...
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