摘要:
The trans-sulfonyl enyne 8 was deprotonated using lithium diisopropylamide to provide a cis-enyne anion which was coupled with a variety of carbonyl compounds to provide, in high yields, a range of silyl-protected phenylsulfonyl enynes. These were desulfonylated in good yields to provide silyl protected terminal cis-enynes. Both these processes were shown to proceed with very good cis-selectivity.