| 摘要 |
NEW MATERIAL:A compound expressed by formula I [R<1> is OH-protecting group; R<2>-R<4> are 1-6C alkyl, phenyl or aralkyl; R<5> is (substituted)phenyl, lower alkyl or aralkyl]. EXAMPLE:(3R,4R)-3-[ (R)-1-tert-Butyldimethylsilyloxyethyl ]-1-p-toluenesufonyl-4- trimethylsilyloxyazetidin-2-one. USE:An intermediate for antibiotic substances, etc. PREPARATION:Enol silyl ethers expressed by formula II are reacted with a compound expressed by the formula R<5>-SO2-NCO. |
