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All articles of this category The total synthesis of the spermidine alkaloid, (+)-( S )-dihydroperiphylline, is described. The key reactions in the present strategy are enantioselective aldol-type reaction of imines with ketene silyl acetals promoted by chiral BLA ( B rønsted acid assisted chiral L ewis a cid) and boron-templated cyclization of triamino esters. (+)-( S )-dihydroperiphylline - spermidine alkaloid - Brønsted acid assisted chiral Lewis acid - aldol-type reaction of imines with ketene silyl acetals - boron-templated cyclization
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Ishihara et al. (1995) studied this question.
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