Enantioselective synthesis of (−)-cytoxazone and (+)-epi-cytoxazone, novel cytokine modulators via Sharpless asymmetric epoxidation and l-proline catalyzed Mannich reaction
作者:Abhimanyu S. Paraskar、Arumugam Sudalai
DOI:10.1016/j.tet.2006.03.079
日期:2006.6
A short and efficient enantioselective synthesis of (−)-cytoxazone and its stereoisomer (+)-epi-cytoxazone, novelcytokinemodulators, has been described with good yield and enantioselectivity. Ti-catalyzed Sharpless asymmetric epoxidation of allyl alcohol and l-proline catalyzed three-component Mannich reaction constitute the key steps in introducing stereogenicity into the molecule.
New route to diltiazem hydrochloride of the formula: ##STR1## in which the starting cinnamyl alcohols are epoxidized by a special asymmetric synthesis followed by a series of stereospecific reactions; no optical resolution is required at any stage.