| 摘要 |
A method for making a compound of formula (I) wherein bonds a and b are single or double bonds, provided that one of a and b is a single bond and the other is a double bond; one of B<SUP>1 </SUP>and B<SUP>2 </SUP>is -CHR<SUP>5</SUP>-CHR<SUP>6</SUP>-C(Y)ZR<SUP>7 </SUP>and the other is absent; B<SUP>3 </SUP>is hydrogen; Y is O or S; Z is O, S or NR<SUP>9</SUP>; R<SUP>5 </SUP>is hydrogen or C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl; R<SUP>6 </SUP>is hydrogen or C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl; R<SUP>7</SUP>, R<SUP>9 </SUP>are independently hydrogen, alkyl, alkenyl, aryl or aralkyl. The method comprises steps of: (a) preparing an imidazolidinethione having formula by combining a cyanide source, a sulfide salt, and at least one ketone or aldehyde; and (b) adding to the imidazolidinethione, without isolation of the imidazolidinethione, CHR<SUP>5</SUP>-CR<SUP>6</SUP>-C(O)OR<SUP>7</SUP>.
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