A Practical Formal Synthesis of <scp>d</scp>-(+)-Biotin from 4-Formylazetidin-2-one
作者:Abdul Deshmukh、Ajaykumar Kale、Vedavati Puranik
DOI:10.1055/s-2007-965992
日期:2007.4
A practical synthesis of (3S,6R)-1,3-dibenzyltetrahydro-1H-furo[3,4-d]imidazole-2,4-dione, an important intermediate in the synthesis of biotin, from 4-formyl-3-mesyloxyazetidin-2-one has been achieved. Acid-catalyzed azetidin-2-one ring opening followed by a one-pot conversion of diamine hydrochloride to a cyclic urea and hydroxymethylene to chloromethylene by triphosgene to obtain (4S,5R)-methyl-1,3-dibenzyl-5-chloromethyl-2-oxoimidazolidine-4-carboxylate is the key step in this synthesis.
由 4-甲酰基-3-甲酰氧基氮杂环丁-2-酮实际合成了(3S,6R)-1,3-二苄基四氢-1H-呋喃并[3,4-d]咪唑-2,4-二酮,这是合成生物素的重要中间体。酸催化氮杂环丁烷-2-酮开环,然后用三光气将二胺盐酸盐转化为环状脲,并将羟甲基转化为氯亚甲基,得到(4S,5R)-甲基-1,3-二苄基-5-氯甲基-2-氧代咪唑烷-4-羧酸酯,这是该合成的关键步骤。