| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R<1> is H, hydroxy, cyano, halogen, acyloxy, etc.; R<2> is hydroxy or acyloxy; R<3> is H, hydroxy, acyloxy or halogen; R<4> is lower alkyl; Y is halogen; n is 0 or 1, etc.). EXAMPLE:1alpha,2alpha,8beta-Tribenzoyloxy-8alphabeta-indolizidine. USE:An immunological regulator. PREPARATION:A compound expressed by formula II is reacted with an acylating agent, e.g. aliphatic carboxylic acid or aromatic carboxylic acid, preferably in the presence of a base in a solvent, e.g. dimethyl sulfoxide, under mild conditions such as while cooling, at room temperature or while warming to afford the aimed compound expressed by formula I.
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