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Partial syntheses of avermectin Bla and ivermectin from avermectin B2a
Authors:H Mrozik  P Eskola  MH Fisher
Institution:Merck Sharp & Dohme Research Laboratories, P. O. Box 2000, Rahway, New Jersey 07065 U.S.A.
Abstract:4″,5-Bis-O-(tert-butyldimethylsilyloxyacetyl)-23-O-(4-methylphenyloxythiocarbonyl)avermectin B2a gave on pyrolysis and deprotection avermectin Bla, while reduction with tri-n-butyltin hydride followed by deprotection afforded 22,23-dihydroavermectin Bla (ivermectin).
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