to the mono MEM protected compound 8b. Dehydration of the tertiary alcoholusing methanesulfonyl chloride-triethylamine-D M A P and treatment of the resulting product with lithium in liquid ammonia afforded 10. The diazoester of 10 was subjected to intramolecular cyclopropanation using a soluble copper complex to obtain 12. Cleavage of the MEM ether, dehydration of the tertiary alcohol followed by reductive