Approaches to the Synthesis of Triterpenoids. II. Some Tetracyclic Precursors Suitable for Conversion into Pentacyclic Triterpenoids
作者:J. W. ApSimon、P. Baker、J. Buccini、J. W. Hooper、S. Macaulay
DOI:10.1139/v72-309
日期:1972.6.15
The stereoselective total synthesis of several partially reduced chrysene derivatives, suitable as precursors for a variety of triterpenoids, is described. The key reaction in the most efficient route involves the highly stereoselective reductive alkylation of a cyclic α,β-unsaturated ketone with allyl bromide in lithium–ammonia, using water as a proton donor.